EP3569690A1 - Menschliche bakterien zur induzierung der proliferation oder anhäufung von regulatorischen t-zellen - Google Patents
Menschliche bakterien zur induzierung der proliferation oder anhäufung von regulatorischen t-zellen Download PDFInfo
- Publication number
- EP3569690A1 EP3569690A1 EP19178787.8A EP19178787A EP3569690A1 EP 3569690 A1 EP3569690 A1 EP 3569690A1 EP 19178787 A EP19178787 A EP 19178787A EP 3569690 A1 EP3569690 A1 EP 3569690A1
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- EP
- European Patent Office
- Prior art keywords
- clostridium
- cells
- mice
- bacteria
- bacterium
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Definitions
- the subject matter described herein relates to a composition of human-derived bacteria that induces proliferation, accumulation, or proliferation and accumulation of regulatory T cells and which comprises, as an active component, (a) one or more (a, at least one) human-derived bacteria that belongs to the Clostridia class, (b) culture supernatant of one or more (a, at least one) of the bacteria; (c) a physiologically active substance derived from one or more of the bacteria or (d) a combination of any two or more of the foregoing. It also relates to a method for inducing proliferation, accumulation or proliferation and accumulation of regulatory T cells.
- the composition which comprises any of (a) - (d) above, is referred to as a bacterial composition.
- the subject matter relates to a method for treating or preventing at least one disease or condition that is responsive to induction of regulatory T cells, such as autoimmune diseases, inflammatory diseases, and infectious diseases, by administering the bacterial composition to an individual in need thereof.
- NPL Non-Patent Literature 1 to 7).
- NPL Document 3 Abnormality in the regulation of cross-talk between commensal bacteria and the immune system (intestinal dysbiosis) may lead to overly robust immune response to environmental antigens and inflammatory bowel disease (IBD) may result (NPL 8 to 10).
- Treg cells regulatory T cells
- NPL 15 specific species of murine bacterial commensals that can strongly stimulate Tregs
- NPL 16 the human intestinal tract harbors more than a thousand bacterial species, many of which have not yet been cultured
- CD4 + T cells are regulatory T cells that have been identified as a cell subset that suppresses immunity.
- a transcription factor, Foxp3 is expressed in CD4 + T cells, which are known to play an important role in maintaining immunological homeostasis (NPL 8, 9, 17, and 18).
- Foxp3-expressing cells are present in large numbers in the colon and only Treg cells present locally in the colon constantly express IL-10, an immunosuppressive cytokine, at a high level (NPL 19). Animals having CD4 + Foxp3 + cells from which IL-10 is specifically removed develop inflammatory bowel disease (NPL 20).
- compositions and methods have been made in view of the above-described problems in the art. Described herein are methods of identifying and culturing intestinal commensal bacteria, isolated from humans, which induce, preferably strongly induce, the proliferation, accumulation, or proliferation and accumulation of regulatory T cells.
- compositions also referred to as bacterial compositions, that (1) comprise (a) one or more of the identified intestinal commensal (human-derived) bacteria; (b) a culture supernatant of one or more of the bacteria; (c) one or more physiologically active substance derived from one or more of the bacteria or from one or more of the culture supernatant; (d) or a combination of any two or three of (a)-(c) and (2) induce the proliferation and/or accumulation of regulatory T cells (Treg cells).
- Treg cells regulatory T cells
- a composition comprises (a) one or more of the identified intestinal commensal (human-derived) bacteria; (b) a culture supernatant of one or more of the bacteria; or (c) one or more physiologically active substance derived from the bacteria or from the culture supernatant, wherein the composition induces proliferation and/or accumulation of regulatory T cells.
- the composition comprises one or more of the identified intestinal commensal (human-derived) bacteria.
- the composition comprises a culture supernatant of one or more of the bacteria.
- the composition comprises one or more physiologically active substance derived from the bacteria or from the culture supernatant.
- the one or more bacteria or one or more physiologically active substance derived from the bacteria is three or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is five or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is seventeen or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is twenty-three or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is 23.
- the bacterial compositions induce, and preferably strongly induce, proliferation, accumulation, or proliferation and accumulation of regulatory T cells that produce an immunosuppressive cytokine, such as IL-10, in the colon (e.g., the human colon) at high levels.
- an immunosuppressive cytokine such as IL-10
- Bacterial compositions comprise, as an active component, at least one organism and/or at least one substance selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- bacterial compositions comprise, as an active component, at least one organism or at least one substance selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- a bacterial composition comprises at least one organism selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp. MANG, Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp.
- Clostridium bolteae ATCC BAA-613 Clostridium bolteae ATCC BAA-613, cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- a bacterial composition comprises a culture supernatant of at least one (a, one or more) of the bacteria described/listed herein. In some embodiments, a bacterial composition comprises a physiologically active substance derived from (a, one or more) bacteria described/listed herein. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is three or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is five or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is 17 or more.
- Bacterial compositions can comprise any bacteria (Clostridia or other bacteria) that contain DNA comprising a nucleotide sequence having sufficient homology with sequences provided herein and that exhibit substantially the same effect on regulatory T cells as that exerted by any one of the following: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- bacteria present in bacterial compositions have at least 90% (90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100%) homology with sequences provided herein, such as, but not limited to, the nucleotide sequences designated OTU herein and listed, for example, at the pages following the last Example.
- such bacteria contain DNA comprising a nucleotide sequence that has at least 90% (90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100%) homology with one or more DNA sequence designated herein as follows: OTU136; OTU46; OTU221; OTU9; OTU296; OTU21; OTU166; OTU73; OTU174; OTU14; OTU55; OTU337; OTU314; OTU195; OTU306; OTU87; OTU86; OTU152; OTU253; OTU259; OTU281; OTU288; OTU334; OTU359; OTU362; or OTU367.
- bacteria contain DNA comprising a nucleotide sequence that has at least 90% (90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100%) homology with DNA of one or more of the following: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF _VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- bacterial compositions comprise bacteria (such as human-derived bacteria) that contain DNA comprising a nucleotide sequence having at least 97%, 98% or 99% homology with sequences provided herein, such as, but not limited to, the nucleotide sequences designated OTU herein and listed, for example, at the pages following the last Example.
- the bacteria in bacterial compositions contain DNA comprising a nucleotide sequence that has at least 97%, 98% or 99% homology with one or more DNA sequence designated herein as follows: OTU136; OTU46; OTU221; OTU9; OTU296; OTU21; OTU166; OTU73; OTU174; OTU14; OTU55; OTU337; OTU314; OTU195; OTU306; OTU87; OTU86; OTU152; OTU253; OTU259; OTU281; OTU288; OTU334; OTU359; OTU362; or OTU367.
- the bacteria contain DNA comprising a nucleotide sequence that has at least 97%, 98% or 99% homology with DNA of one or more of the following: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- compositions that comprise, as an active component, (a) one or more of certain species of bacteria that belong to the Clostridia class or bacteria that contain DNA comprising a nucleotide sequence having at least 90% homology with sequences provided herein, in spore form or in vegetative form; (b) a culture supernatant of one or more such bacteria; (c) one or more physiologically active substance derived from (a) or (b); or (d) a combination of any two or three of (a), (b) and (c) and induce the proliferation and/or accumulation of regulatory T cells (Treg cells) suppress immune functions.
- Treg cells regulatory T cells
- One embodiment is a composition that induces proliferation, accumulation or both proliferation and accumulation of regulatory T cells, the composition comprising, as an active component, at least one organism and/or at least one substance selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- the active component is one or more of Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp. MANG, Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp.
- Clostridium bolteae ATCC BAA-613 Clostridium bolteae ATCC BAA-613, cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- the active component is a culture supernatant of one or more of the bacteria described/listed herein. In some embodiments, the active component is one or more physiologically active substances derived from a bacterium described/ listed herein. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is three or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is five or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is 17 or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is 23 or more. In some embodiments, the one or more bacteria or one or more physiologically active substance derived from the bacteria is 23.
- a bacterial composition as described herein comprises at least one of the following: one bacteria as described herein; at least one culture supernatant obtained from culture in which one (or more) of the bacteria was present (grown or maintained) or a fraction of such a supernatant; one or more physiologically active substance derived from one or more bacteria (such as from the bacteria named herein) or a combination of any two or three of the foregoing.
- the term composition/bacterial composition refers to all such combinations.
- the bacteria in the composition can be, for example, Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp. MANG, Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp.
- Clostridium bolteae ATCC BAA-613 Clostridium bolteae ATCC BAA-613, cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- 90% homology e.g., 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% homology
- the bacteria contain DNA comprising a nucleotide sequence that has at least 97% , at least 98% or at least 99% homology with one or more DNA sequence designated herein as follows: OTU136; OTU46; OTU221; OTU9; OTU296; OTU21; OTU166; OTU73; OTU174; OTU14; OTU55; OTU337; OTU314; OTU195; OTU306; OTU87; OTU86; OTU152; OTU253; OTU259; OTU281; OTU288; OTU334; OTU359; OTU362; or OTU367.
- the bacteria contain DNA comprising a nucleotide sequence that has at least 97% (97%, 98%, 99%, 100%) homology with DNA of one or more of the following: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- the composition induces regulatory T cells that are transcription factor Foxp3-positive regulatory T cells or TL-10-producing regulatory T cells. In another embodiment, the composition has an immunosuppressive effect.
- One embodiment is a pharmaceutical composition that induces proliferation, accumulation or both proliferation and/or accumulation of regulatory T cells and suppresses immune function.
- the pharmaceutical composition comprises a bacterial composition described herein and a pharmaceutically acceptable component, such as a carrier, a solvent or a diluent.
- a pharmaceutical composition comprises (a) (1) one or more species of bacteria belonging to the Clostridia class, as described herein, in spore form or in vegetative form, (2) a culture supernatant of such bacteria, (3) a physiologically active substance derived therefrom or (4) a combination of any two or three of (1), (2) and (3) and (b) a pharmaceutically acceptable component, such as carrier, a solvent or a diluent.
- (a) above is at least one organism or substance selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp. MANG, Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp.
- Clostridium bolteae ATCC BAA-613 Clostridium bolteae ATCC BAA-613, cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- (a) above is at least one organism selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp. MANG, Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp.
- Clostridium bolteae ATCC BAA-613 Clostridium bolteae ATCC BAA-613, cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- (1) above is a culture supernatant of one or more of the bacteria. In some embodiments, (1) above is a physiologically active substance derived from one or more of the bacteria. In some embodiments, the at least one organism or substances is three or more. In some embodiments, the at least one organism or substances is five or more. In some embodiments, the at least one organism or substances is 17 or more. In some embodiments, the at least one organism or substances is 23 or more. In some embodiments, the at least one organism or substances is 23.
- bacteria such as human-derived bacteria
- DNA comprising at least 90% homology (e.g., 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% homology) with sequences provided herein, such as, but not limited to, the nucleotide sequences designated OTU herein and listed, for example, at the pages following the last Example.
- the bacteria contain DNA comprising a nucleotide sequence that has at least 97% , at least 98% or at least 99% homology with one or more DNA sequence designated herein as follows: OTU136; OTU46; OTU221; OTU9; OTU296; OTU21; OTU166; OTU73; OTU174; OTU14; OTU55; OTU337; OTU314; OTU195; OTU306; OTU87; OTU86; OTU152; OTU253; OTU259; OTU281; OTU288; OTU334; OTU359; OTU362; or OTU367.
- the bacteria in the pharmaceutical composition contain DNA comprising a nucleotide sequence that has at least 97% (97%, 98%, 99%, 100%) homology with DNA of one or more of the following: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF _VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- the pharmaceutical composition induces the proliferation and/or accumulation of regulatory T cells (Treg cells) and suppresses immune function.
- Treg cells regulatory T cells
- Also provided is a method of inducing proliferation, accumulation or both proliferation and accumulation of regulatory T cells in an individual e.g., an individual in need thereof, such as an individual in need of induction of proliferation and/or accumulation of regulatory T cells.
- the method comprises administering to the individual a bacterial composition described herein or a pharmaceutical composition comprising a bacterial composition described herein.
- Clostridium bolteae ATCC BAA-613 Clostridium bolteae ATCC BAA-613, cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- compositions described may be administered to an individual in need of treatment, reduction in the severity of or prevention of a disease or condition such as an autoimmune disease, an inflammatory disease, an allergic disease, and an infectious disease.
- administration of the bacterial composition may be in combination with, or preceded by, a course of one or more antibiotics.
- administration of the bacterial composition may be in combination with administration of at least one prebiotic substance that preferentially favors the growth of the species in the bacterial composition over the growth of other human commensal bacterial species.
- the prebiotic substance(s) is, for example, a nondigestible oligosaccharide.
- the one or more prebiotic substance(s) is selected from the group consisting of almond skin, inulin, oligofructose, raffinose, lactulose, pectin, hemicellulose, amylopectin, acetyl-Co A, biotin, beet molasses, yeast extracts, and resistant starch.
- a composition that comprises the bacterial composition and at least one prebiotic substance.
- the bacterial composition may be administered in combination with a substance selected from the group consisting of corticosteroids, mesalazine, mesalamine, sulfasalazine, sulfasalazine derivatives, immunosuppressive drugs, cyclosporin A, mercaptopurine, azathiopurine, prednisone, methotrexate, antihistamines, glucocorticoids, epinephrine, theophylline, cromolyn sodium, anti-leukotrienes, anti-cholinergic drugs for rhinitis, anti-cholinergic decongestants, mast-cell stabilizers, monoclonal anti-IgE antibodies, vaccines, anti-TNF inhibitors such as infliximab, adalimumab, certolizumab pegol, golimumab, or etanercept, and combinations thereof.
- compositions that comprises the bacterial composition and at least one substance selected from the group consisting of corticosteroids, mesalazine, mesalamine, sulfasalazine, sulfasalazine derivatives, immunosuppressive drugs, cyclosporin A, mercaptopurine, azathiopurine, prednisone, methotrexate, antihistamines, glucocorticoids, epinephrine, theophylline, cromolyn sodium, anti-leukotrienes, anti-cholinergic drugs for rhinitis, anti-cholinergic decongestants, mast-cell stabilizers, monoclonal anti-IgE antibodies, vaccines, anti-TNF inhibitors such as infliximab, adalimumab, certolizumab pegol, golimumab, or etanercept, and combinations thereof.
- corticosteroids such as infliximab
- the bacterial composition can be used as an adjuvant to improve the efficacy of a vaccine formulation.
- the bacterial composition can be used as an adjuvant to a vaccine for the prophylaxis or treatment of an autoimmune disease or an allergic disease.
- a method for prophylaxis or treatment is provided, the method comprising administering the bacterial composition and adminstering a vaccine.
- Assessment of the extent of induction of proliferation or accumulation of regulatory T cells that results from administration of a composition described herein can be carried out by a variety of approaches, such as by measurement of the number of Foxp3-expressing Tregs in a patient sample (such as a biopsy or a blood sample), promotion of IL-10 expression, promotion of CTLA4 expression, promotion of IDO expression, suppression of IL-4 expression, or colonization of an individual with the bacterial composition.
- the results of such assessments are used as an index of the induction of proliferation or accumulation of regulatory T cells in the individual.
- administration of a composition described herein causes induction of the regulatory T cells that are transcription factor Foxp3-positive regulatory T cells or IL-10-producing regulatory T cells.
- composition described herein can be administered by a variety of routes and in one embodiment, is administered orally to an individual in need thereof, such as a patient in need thereof.
- the composition may be administered in a number of oral forms, such as in spore-form (in a dry powder or dissolved in a liquid formulation), in enteric capsules, in sachets, or in a food matrix, such as yogurt, or a drink.
- the method comprises (a) obtaining a (at least one, one or more) sample, such as a fecal sample or a colonic biopsy, from a patient before he or she is treated with a bacterial composition described herein; (b) measuring or determining the percentage or absolute counts in the sample of at least one bacterial species selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- a sample such as a fecal sample or a colonic biopsy
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF _VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- the method further comprises (d) administering the bacterial composition to the patient if the percentage or count in the sample obtained from the patient is lower than the baseline value.
- the method may further comprise measuring in a patient's sample (e.g., a fecal sample or a colonic biopsy) the percentages or absolute counts of other commensal species that belong to Clostridium Clusters IV and XIVa, but are not present in the bacterial composition, wherein a value of the percentage or absolute count (measurement) lower than baseline further indicates that the subject may respond favorably to administration of the bacterial compositions.
- the method further comprises administering the bacterial composition to the patient if the value of the percentage or absolute count (measurement) is lower than baseline.
- the patient being assessed suffers from inflammatory bowel disease or a C. difficile infection.
- Also provided is a method of monitoring a subject's response to treatment with the bacterial compositions of the invention comprising: (a) obtaining a (at least one) sample, such as a fecal sample or a colonic biopsy from a patient before treatment with a bacterial composition described herein; (b) obtaining, a (at least one) corresponding sample from the patient after treatment with a bacterial composition described herein; and (c) comparing the percentage or absolute counts of at least one bacterial species selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- a sample such as a fecal sample or a colonic biopsy from a patient before treatment with
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1 57FAA CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- the method further comprises (d) further administering the bacterial composition to the patient or ceasing adminstration of the bacterial composition to the patient based on the comparison in (c).
- the method may further comprise measuring in the subject's samples the percentages or absolute counts of other commensal species that belong to Clostridium Clusters IV and XIVa, but are not present in the bacterial composition, wherein a higher value after treatment than before treatment indicates that the subject has responded favorably to treatment.
- compositions described herein which contain, as an active component, selected bacteria belonging to the Clostridia class or other bacteria, as described herein; a culture supernatant of such bacteria; a physiologically active substance derived from such bacteria; or a combination of two or three of the foregoing are excellent at inducing the proliferation or accumulation of regulatory T cells (Treg cells).
- Immunity in an individual can be suppressed through administration of the subject composition, such as through ingestion of the bacterial composition in a food or beverage or as a dietary supplement or through administration of a pharmaceutical composition comprising the bacterial composition.
- the subject composition can be used, for example, to prevent or treat autoimmune diseases, allergic diseases, infectious diseases, as well as to suppress immunological rejection in organ transplantation or the like.
- a food or beverage such as a health food
- healthy individuals can ingest the composition easily and routinely. As a result, it is possible to induce the proliferation and/or accumulation of regulatory T cells and thereby to improve immune functions.
- composition described herein provides for a natural, long-lasting, patient-friendly, and benign treatment alternative for immune-mediated conditions.
- inflammatory bowel disease is currently managed with synthetic drugs that may have severe side effects (such as corticosteroids, TNF inhibitors), cannot be administered orally (such as TNF inhibitors), have inconvenient dosing involving several pills a day (such as mesalazine or sulfasalazine) or have limited efficacy and short-lived effects (such as currently marketed probiotics, e.g. Lactobacillus GG, Lactobacillus acidophilus, Bifidobacterium longum, etc).
- synthetic drugs that may have severe side effects (such as corticosteroids, TNF inhibitors), cannot be administered orally (such as TNF inhibitors), have inconvenient dosing involving several pills a day (such as mesalazine or sulfasalazine) or have limited efficacy and short-lived effects (such as
- compositions that induces proliferation, accumulation of regulatory T cells or both proliferation and accumulation of regulatory T cells.
- the composition comprises, as an active ingredient, one or more of the following: a (at least one, one or more) organism selected from the group consisting of: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- Bacteria described herein were isolated from human fecal samples using the methods outlined in Examples 19 to 28.
- regulatory T cells refers to T cells that suppress an abnormal or excessive immune response and play a role in immune tolerance.
- the regulatory T cells are typically transcription factor Foxp3-positive CD4-positive T cells.
- the regulatory T cells of the present invention also include transcription factor Foxp3-negative regulatory T cells that are IL-10-producing CD4-positive T cells.
- inces proliferation or accumulation of regulatory T cells refers to an effect of inducing the differentiation of immature T cells into regulatory T cells, which differentiation leads to the proliferation and/or the accumulation of regulatory T cells. Further, the meaning of "induces proliferation or accumulation of regulatory T cells” includes in-vivo effects, in vitro effects, and ex vivo effects.
- the effect of inducing proliferation or accumulation of regulatory T cells can be evaluated, for example, as follows. Specifically, the aforementioned bacteria belonging to the Clostridia class, a culture supernatant of the bacteria or supernatant component(s), or a physiologically active substance derived from the bacteria is orally administered to an experimental animal, such as a germ-free mouse, then CD4-positive cells in the colon are isolated, and the ratio of regulatory T cells contained in the CD4-positive cells is measured by flow cytometry (refer to Example 7).
- the regulatory T cells whose proliferation or accumulation is induced by the composition of the present invention are preferably transcription factor Foxp3-positive regulatory T cells or IL-10-producing regulatory T cells.
- human-derived bacteria means bacterial species that have been isolated from a fecal sample or from a gastrointestinal biopsy obtained from a human individual or whose ancestors were isolated from a fecal sample or from a gastrointestinal biopsy obtained from a human (e.g., are progeny of bacteria obtained from a fecal sample or a gastrointestinal biopsy).
- the bacterial species may have been previously isolated from a fecal sample or from a gastrointestinal biopsy obtained from a human and cultured for a sufficient time to generate progeny. The progeny can then be further cultured or frozen.
- the human-derived bacteria are naturally occurring commensals that populate the gastrointestinal tract of human individuals, preferably healthy human individuals.
- Clostridia class refers to a class of Gram+, obligate anaerobic bacteria belonging to the Firmicutes phylum that have the ability to form spores. It is important to note that while currently most bacteria in this class are included in the Clostridiales order, this categorization is still partly based on old methods and is likely to be redefined in the future based on new advances in sequencing technologies that are enabling sequencing of the full genomes of bacteria in this class.
- Table 2 provides a summary of the categorization of 17 abundant species belonging to the Clostridia class which have been identified by the inventors as strong Treg-inducers and cultured in vitro. All of these species fall, under current categorization rules, in the Clostridiaceae family, and belong to clusters IV, XIVa, XVI, and XVIII.
- the composition of the present invention may include one strain alone (only one strain) of any of the aforementioned bacterial species, but two or more strains of the bacteria can be used together. For example, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen or seventeen of the strains listed in Table 2 or Table 4, in any combination, can be used together to affect regulatory T cells. In some embodiments, the 23, 17, 5, or 3 species mixes listed in Table 4 can be used together (and administered in one or several compositions) to affect regulatory T cells.
- the following strains can be combined (the composition comprises): strain 1 (OTU136, closest species: Clostridium saccharogumia, Clostridium ramosum JCM1298), strain 3 (OTU221, closest species: Flavonifractor plautii, Pseudoflavonifractor capillosus ATTC 29799), strain 4 (OTU9, closest species: Clostridium hathewayi, Clostridium saccharolyticum WM1), strain 5 (OTU296, closest species: Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA), strain 6 (OTU21, closest species: Blautia coccoides, Lachnospiraceae bacterium 6_1_63FAA), strain 7 (OUT 166, closest species: Clostridium sp., Clostridium bolteae ATCC BAA-613), strain 8 (OTU73, closest species: cf.
- strain 1 OTU136
- strain 15 Lachnospiraceae bacterium 2_1_46FAA
- strain 16 (OTU306, closest species: Clostridium symbiosum, Clostridium symbiosum WAL-14163)
- strain 18 (OTU46, closest species: Clostridium ramosum, Clostridium ramosum)
- strain 21 (OTU87, closest species: Eubacterium contortum, Clostridium sp.
- strain 23 (OTU152, closest species: Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1)
- strain 24 (OTU253, closest species: Oscillospiraceae bacterium NML 061048, Oscillibacter valericigenes)
- strain 25 (OTU259, closest species: Eubacterium contortum, Clostridium sp.
- strain 26 (OTU281, closest species: Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA), strain 27 (OTU288, closest species: Lachnospiraceae bacteriumA4, Lachnospiraceae bacterium 3_1_57FAA_CT1), strain 28 (OTU344, closest species: Clostridium sp. 316002/08, Clostridiales bacterium 1_7_47FAA), and strain 29 (OTU359, closest species: Lachnospiraceae bacteriumA4, Lachnospiraceae bacterium 3_1_57FAA_CT1) as described in Table 4.
- the composition comprises: strain 1 (OTU136, closest species: Clostridium saccharogumia, Clostridium ramosum JCM1298), strain 3 (OTU221, closest species: Flavonifractor plautii, Pseudoflavonifractor capillosus ATTC 29799), strain 4 (OTU9, closest species: Clostridium hathewayi, Clostridium saccharolyticum WM1), strain 6 (OTU21, closest species: Blautia coccoides, Lachnospiraceae bacterium 6_1_63FAA), strain 7 (OUT 166, closest species: Clostridium sp., Clostridium bolteae ATCC BAA-613), strain 8 (OTU73, closest species: cf.
- strain 1 OTU136, closest species: Clostridium saccharogumia, Clostridium ramosum JCM1298)
- strain 3 OTU221, closest species: Flavonifractor plaut
- strain 15 Lachnospiraceae bacterium 2_1_46FAA
- strain 16 (OTU306, closest species: Clostridium symbiosum, Clostridium symbiosum WAL-14163)
- strain 18 (OTU46, closest species: Clostridium ramosum, Clostridium ramosum)
- strain 21 (OTU87, closest species: Eubacterium contortum, Clostridium sp.
- strain 26 (OTU281, closest species: Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA), strain 27 (OTU288, closest species: Lachnospiraceae bacteriumA4, Lachnospiraceae bacterium 3_1_57FAA_CT1), strain 28 (OTU344, closest species: Clostridium sp. 316002/08, Clostridiales bacterium 1_7_47FAA), and strain 29 (OTU359, closest species: Lachnospiraceae bacteriumA4, Lachnospiraceae bacterium 3_1_57FAA_CT1) as described in Table 4.
- the following strains can be combined (the composition comprises): strain 1 (OTU136, closest species: Clostridium saccharogumia, Clostridium ramosum JCM1298), strain 4 (OTU9, closest species: Clostridium hathewayi, Clostridium saccharolyticum WM1), strain 16 (OTU306, closest species: Clostridium symbiosum, Clostridium symbiosum WAL-14163), strain 27 (OTU288, closest species: Lachnospiraceae bacteriumA4, Lachnospiraceae bacterium 3_1_57FAA_CT1), and strain 29 (OTU359, closest species: Lachnospiraceae bacteriumA4, Lachnospiraceae bacterium 3_1_57FAA_CT1) as described in Table 4.
- strain 1 OTU136, closest species: Clostridium saccharogumia, Clostridium ramosum JCM1298)
- strain 4 OTU9, closest species:
- strain 6 (OTU21, closest species: Blautia coccoides, Lachnospiraceae bacterium 6_1_63FAA), strain 8 (OTU73, closest species: cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A), strain 13 (OTU337, closest species: Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241), strain 14 (OTU314, closest species: Ruminococcus sp.
- strain 3 (OTU221, closest species: Flavonifractor plautii, Pseudoflavonifractor capillosus ATTC 29799)
- strain 7 (OUT 166, closest species: Clostridium sp., Clostridium bolteae ATCC BAA-613)
- strain 9 (OTU174, closest species: Clostridium indolis, Anaerostipes caccae DSM 14662), strain 15 (OTU195, closest species: Clostridium lavalense, Clostridium asparagiforme DSM 15981), and strain 28 (OTU344, closest species: Clostridium sp.
- strain 1 (OTU136, closest species: Clostridium saccharogumia, Clostridium ramosum JCM1298)
- strain 2 (OTU46, closest species: Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799)
- strain 3 (OTU221, closest species: Flavonifractor plautii, Pseudoflavonifractor capillosus ATTC 29799) as described in Table 4.
- Clostridium cluster XIVa or the cluster IV can bring about an excellent effect on regulatory T cells.
- Clostridium ramosum, Clostridium saccharogumia (belonging to cluster XVIII) and cf. Clostridium sp. MLG055 (belonging to cluster XVI) can also be used.
- the number and ratio of strains used can vary widely.
- the number and ratio to be used can be determined based on a variety of factors (e.g., the desired effect, such as induction or inhibition of proliferation or accumulation of regulatory T cells; the disease or condition to be treated, prevented or reduced in severity; the age or gender of the recipient; the typical amounts of the strains in healthy humans).
- the strains can be present in a single composition, in which case they can be consumed or ingested together (in a single composition), or can be present in more than one composition (e.g., each can be in a separate composition), in which case they can be consumed individually or the compositions can be combined and the resulting combination (combined compositions) consumed or ingested.
- any number or combination of the strains that proves effective e.g., any number from one to 22, such as 1 to 20, 1 to 15, 1 to 10, 1 to 5, 1 to 3, 1 to 2, and any number therebetween or one to 23, such as 1 to 23, 3 to 23, 5 to 23, 1 to 20, 1 to 17, 3 to 17, 5 to 17, 1 to 15, 1 to 10, 1 to 5, 3 to 5, 1 to 3, 1 to 2, and any number therebetween) can be administered.
- a combination of some or all of the 22 or 23 (e.g., the 23 strains in Exampe 32 and Table 4) strains described in the present disclosure is used.
- the 22 or 23 e.g., the 23 strains in Exampe 32 and Table 4
- at least one, two or more, three, three or more, four, four or more, five, five or more, six, six or more or any other number of the 22 or 23 described strains, including 22 or 23 strains can be used.
- the specific combinations of 3, 5, 17, or 23 strains described in Table 4 can be used (the composition comprises combinations of 3, 5, 17 or 23 strains described in Table 4). They can be used in combination with one another and in combination with strains not described in the cited reference.
- Cells of bacteria belonging to the Clostridia class can be used in spore form or in vegetative form.
- the bacteria may be preferably in the form of spore.
- the bacteria may alternatively be produced (and later administered) in the form of vegetative cells.
- the term the "physiologically active substance derived from bacteria belonging to the Clostridia class" of the present invention includes substances contained in the bacteria, secretion products of the bacteria, and metabolites of the bacteria.
- a physiologically active substance can be identified by purifying an active component from the bacteria, a culture supernatant thereof, or intestinal tract contents in the intestinal tract of a mouse in which only bacteria belonging to the Clostridia class are colonized by an already known purification method.
- Chloroform treatment of a fecal sample obtained from a human is a method that isolates the bacteria in the fecal sample that have the ability to form spores, and is not particularly limited, as long as the spore-forming fraction is obtained by treating feces of a human with chloroform (for example, 3% chloroform), and has the effect of inducing proliferation or accumulation of regulatory T cells, including mammalian regulatory T cells such as murine regulatory T cells and human regulatory T cells.
- culture supernatant of the bacteria in the composition of the present invention includes such substances, secretion products, and metabolites.
- the culture supernatant is not particularly limited, as long as the culture supernatant has the effect of inducing proliferation or accumulation of regulatory T cells.
- Examples of the culture supernatant include a protein fraction of the culture supernatant, a polysaccharide fraction of the culture supernatant, a lipid fraction of the culture supernatant, and a low-molecular weight metabolite fraction of the culture supernatant.
- the bacterial composition may be administered in the form of a pharmaceutical composition, a dietary supplement, or a food or beverage (which may also be an animal feed), or may be used as a reagent for an animal model experiment.
- the pharmaceutical composition, the dietary supplement, the food or beverage, and the reagent induce proliferation or accumulation of regulatory T cells.
- An example presented herein revealed that regulatory T cells (Treg cells) induced by bacteria or the like belonging to the Clostridia class suppressed the proliferation of effector T-cells.
- the composition of the present invention can be used suitably as a composition having an immunosuppressive effect.
- the immunosuppressive effect can be evaluated, for example, as follows.
- Regulatory T cells isolated from an experimental animal, such as a mouse, to which the composition of the present invention is orally administered are caused to act on effector T-cells (CD4 + CD25 - cells) isolated from the spleen, and the proliferation ability thereof is measured by using the intake amount of [ 3 H]-thymidine as an index (refer to Example 14).
- the bacterial composition of the present invention can be used, for example, as a pharmaceutical composition for preventing or treating (reducing, partially or completely, the adverse effects of) an autoimmune disease, such as chronic inflammatory bowel disease, systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, or Hashimoto's disease; an allergic disease, such as a food allergy, pollenosis, or asthma; an infectious disease, such as an infection with Clostridium difficile; an inflammatory disease such as a TNF-mediated inflanunatory disease (e.g., an inflammatory disease of the gastrointestinal tract, such as pouchitis, a cardiovascular inflammatory condition, such as atherosclerosis, or an inflammatory lung disease, such as chronic obstructive pulmonary disease); a pharmaceutical composition for suppressing rejection in organ transplantation or other situations in which tissue rejection might occur; a supplement, food, or beverage for improving immune functions; or a reagent for suppressing the proliferation or function of effector T-cells.
- target diseases for which the composition is useful for treatment include autoimmune diseases, allergic diseases, infectious diseases, and rejection in organ transplantations, such as inflammatory bowel disease (IBD), ulcerative colitis, Crohn's disease, sprue, autoimmune arthritis, rheumatoid arthritis, Type I diabetes, multiple sclerosis, graft vs.
- IBD inflammatory bowel disease
- target diseases for which the composition is useful for treatment include colon cancer, cystic fibrosis, celiac disease, Type 2 diabetes, and autism-related immunopathologies. These diseases are characterized by a reduction of Clostridium Clusters IV and XIV in the gastrointestinal microbiota.
- compositions described herein can also be used as a pharmaceutical composition for preventing or treating infectious diseases in an individual whose resistance to the infectious diseases is impaired, for example because of damage due to excessive inflammation caused by the immunity or due to an alteration of the patient's microbiome.
- infectious pathogens that impair maintenance or recovery of homeostasis of a host, and which eventually bring about such immunopathological tissue damage include Salmonella, Shigella, Clostridium difficile, Mycobacterium (which cause the disease tuberculosis), protozoa (which cause malaria), filarial nematodes (which cause the disease filariasis), Schistosoma (which cause schistosomiasis), Toxoplasma (which cause the disease toxoplasmosis), Leishmania (which cause the disease leishmaniasis), HCV and HBV (which cause the disease hepatitis C and hepatitis B), and herpes simplex viruses (which cause the disease herpes).
- compositions can be formulated from the bacterial compositions described by drug formulation methods known to those of skill in the art.
- the composition can be used orally or parenterally in the form of capsules, tablets, pills, sachets, liquids, powders, granules, fine granules, film-coated preparations, pellets, troches, sublingual preparations, chewables, buccal preparations, pastes, syrups, suspensions, elixirs, emulsions, liniments, ointments, plasters, cataplasms, transdermal absorption systems, lotions, inhalations, aerosols, injections, suppositories, and the like.
- the bacterial compositions can be used in appropriate combination with carriers that are pharmacologically acceptable or acceptable for ingestion, such as in a food or beverage, including one or more of the following: sterile water, physiological saline, vegetable oil, solvent, a base material, an emulsifier, a suspending agent, a surfactant, a stabilizer, a flavoring agent, an aromatic, an excipient, a vehicle, a preservative, a binder, a diluent, a tonicity adjusting agent, a soothing agent, a bulking agent, a disintegrating agent, a buffer agent, a coating agent, a lubricant, a colorant, a sweetener, a thickening agent, a flavor corrigent, a solubilizer, and other additives.
- carriers that are pharmacologically acceptable or acceptable for ingestion, such as in a food or beverage, including one or more of the following: sterile water, physiological saline, vegetable oil,
- a pharmaceutical preparation or formulation and particularly a pharmaceutical preparation for oral administration comprises an additional component that enables efficient delivery of the bacterial composition of the present invention to the colon, in order to more efficiently induce proliferation or accumulation of regulatory T cells in the colon.
- a variety of pharmaceutical preparations that enable the delivery of the bacterial composition to the colon can be used. Examples thereof include pH sensitive compositions, more specifically, buffered sachet formulations or enteric polymers that release their contents when the pH becomes alkaline after the enteric polymers pass through the stomach.
- the pH sensitive composition is preferably a polymer whose pH threshold of the decomposition of the composition is between about 6.8 and about 7.5.
- Such a numeric value range is a range in which the pH shifts toward the alkaline side at a distal portion of the stomach, and hence is a suitable range for use in the delivery to the colon.
- a pharmaceutical preparation useful for delivery of the bacterial composition to the colon is one that ensures the delivery to the colon by delaying the release of the contents (e.g., the bacterial composition) by approximately 3 to 5 hours, which corresponds to the small intestinal transit time.
- a hydrogel is used as a shell. The hydrogel is hydrated and swells upon contact with gastrointestinal fluid, with the result that the contents are effectively released (released predominantly in the colon). Delayed release dosage units include drug-containing compositions having a material which coats or selectively coats a drug or active ingredient to be administered.
- Examples of such a selective coating material include in vivo degradable polymers, gradually hydrolyzable polymers, gradually water-soluble polymers, and/or enzyme degradable polymers.
- a wide variety of coating materials for efficiently delaying the release is available and includes, for example, cellulose-based polymers such as hydroxypropyl cellulose, acrylic acid polymers and copolymers such as methacrylic acid polymers and copolymers, and vinyl polymers and copolymers such as polyvinylpyrrolidone.
- composition enabling the delivery to the colon further include bioadhesive compositions which specifically adhere to the colonic mucosal membrane (for example, a polymer described in the specification of US Patent No. 6.368.586 ) and compositions into which a protease inhibitor is incorporated for protecting particularly a biopharmaceutical preparation in the gastrointestinal tracts from decomposition due to an activity of a protease.
- bioadhesive compositions which specifically adhere to the colonic mucosal membrane
- compositions into which a protease inhibitor is incorporated for protecting particularly a biopharmaceutical preparation in the gastrointestinal tracts from decomposition due to an activity of a protease.
- An example of a system enabling the delivery to the colon is a system of delivering a composition to the colon by pressure change in such a way that the contents are released by utilizing pressure change caused by generation of gas in bacterial fermentation at a distal portion of the stomach.
- a system is not particularly limited, and a more specific example thereof is a capsule which has contents dispersed in a suppository base and which is coated with a hydrophobic polymer (for example, ethyl cellulose).
- Another example of the system enabling the delivery to the colon is a system of delivering a composition to the colon, the system being specifically decomposed by an enzyme (for example, a carbohydrate hydrolase or a carbohydrate reductase) present in the colon.
- an enzyme for example, a carbohydrate hydrolase or a carbohydrate reductase
- Such a system is not particularly limited, and more specific examples thereof include systems which use food components such as non-starch polysaccharides, amylose, xanthan gum, and azopolymers.
- the bacterial composition When used as a pharmaceutical preparation, the bacterial composition may be used in combination with an already known pharmaceutical composition for use in immunosuppression.
- the pharmaceutical preparation can comprise both the bacterial composition and the already known pharmaceutical composition.
- a known pharmaceutical composition is not particularly limited, and may be at least one therapeutic composition selected from the group consisting of corticosteroids, mesalazine, mesalamine, sulfasalazine, sulfasalazine derivatives, immunosuppressive drugs, cyclosporin A, mercaptopurine, azathiopurine, prednisone, methotrexate, antihistamines, glucocorticoids, epinephrine, theophylline, cromolyn sodium, anti-leukotrienes, anti-cholinergic drugs for rhinitis, anti-cholinergic decongestants, mast-cell stabilizers, monoclonal anti-IgE antibodies, vaccines (preferably vaccines used
- the bacterial composition can also be used as an adjuvant to improve the efficacy of a vaccine formulation such as a vaccine for the prophylaxis or treatment of an autoimmune disease or an allergic disease.
- the bacterial composition can be used as a food or beverage, such as a health food or beverage, a food or beverage for infants, a food or beverage for pregnant women, athletes, senior citizens or other specified group, a functional food, a beverage, a food or beverage for specified health use, a dietary supplement, a food or beverage for patients, or an animal feed.
- a food or beverage such as a health food or beverage, a food or beverage for infants, a food or beverage for pregnant women, athletes, senior citizens or other specified group, a functional food, a beverage, a food or beverage for specified health use, a dietary supplement, a food or beverage for patients, or an animal feed.
- the foods and beverages include various beverages such as juices, refreshing beverages, tea beverages, drink preparations, jelly beverages, and functional beverages; alcoholic beverages such as beers; carbohydrate-containing foods such as rice food products, noodles, breads, and pastas; paste products such as fish hams, sausages, paste products of seafood; retort pouch products such as curries, food dressed with a thick starchy sauces, and Chinese soups; soups; dairy products such as milk, dairy beverages, ice creams, cheeses, and yogurts; fermented products such as fermented soybean pastes, yogurts, fermented beverages, and pickles; bean products; various confectionery products such as Western confectionery products including biscuits, cookies, and the like, Japanese confectionery products including steamed bean-jam buns, soft adzuki-bean jellies, and the like, candies, chewing gums, gummies, cold desserts including jellies, cream caramels, and frozen desserts; instant foods such as instant soups and instant soy-bean soups;
- the examples also include health foods and beverages prepared in the forms of powders, granules, tablets, capsules, liquids, pastes, and jellies.
- the composition of the present invention can be used for animals, including humans.
- the animals, other than humans, are not particularly limited, and the composition can be used for various livestock, poultry, pets, experimental animals, and the like.
- Specific examples of the animals include pigs, cattle, horses, sheep, goats, chickens, wild ducks, ostriches, domestic ducks, dogs, cats, rabbits, hamsters, mice, rats, monkeys, and the like, but the animals are not limited thereto.
- the bacterial composition is capable of conditioning absorption of nutrients and improving feed efficiency. From such a viewpoint, the bacterial composition can be used for promoting body weight gain, or for a high efficiency animal feed.
- Diseases and conditions that would benefit from body weight gain include, e.g., starvation, cancer, AIDS, gastrointestinal disorders (e.g., celiac disease, peptic ulcer, inflammatory bowel disease (Crohns' disease and ulcerative colitis), pancreatitis, gastritis, diarrhea), hyperthyroidism, infection, renal disease, cardiac disease, pulmonary disease, connective tissue disease, weight loss caused by medications, anorexia, Addison's disease, dementia, depression, hypercalcemia, Parkinson's disease and tuberculosis.
- gastrointestinal disorders e.g., celiac disease, peptic ulcer, inflammatory bowel disease (Crohns' disease and ulcerative colitis), pancreatitis, gastritis, diarrhea
- hyperthyroidism infection
- renal disease cardiac disease
- pulmonary disease connective tissue disease
- weight loss caused by medications exia, Addison's disease, dementia, depression, hypercalcemia, Parkinson's disease and tuberculosis.
- the addition of the bacterial composition to an antibiotic-free animal feed makes it possible to increase the body weight of an animal that ingests the animal feed to a level equal to or higher than that achieved by animal ingesting antibiotic-containing animal feeds, and also makes it possible to reduce pathogenic bacteria in the stomach to a level equal to those in animals consuming typical antibiotic-containing animal feeds.
- the bacterial composition can be used as a component of an animal feed that does not need the addition of antibiotics.
- the present bacterial composition in spore form can be pelletized, sprayed, or easily mixed with an animal feed and can also be added to drinking water.
- Animal feed comprising the bacterial composition can be fed to a wide variety of types of animals and animals of a varying ages and can be fed at regular intervals or for a certain period (for example, at birth, during weaning, or when the animal is relocated or shipped).
- the bacterial composition can be used to promote weight gain and enhance energy absorption in humans and nonhumans (e.g., farm or other food animals).
- the bacterial active components of the bacterial composition can be manufactured using fermentation techniques well known in the art.
- the active ingredients are manufactured using anaerobic fermentors, which can support the rapid growth of bacterial species belonging to the Clostridia class.
- the anaerobic fermentors may be, for example, stirred tank reactors or disposable wave bioreactors.
- Culture media such as BL media and EG media, or similar versions of these media devoid of animal components can be used to support the growth of the bacterial species.
- the bacterial product can be purified and concentrated from the fermentation broth by traditional techniques, such as centrifugation and filtration, and can optionally be dried and lyophilized by techniques well known in the art.
- a food or beverage comprising a bacterial composition described herein can be manufactured by manufacturing techniques well known in the technical field.
- One or more components for example, a nutrient which are effective for the improvement of an immune function by an immunosuppressive effect may be added to the food or beverage.
- the food or beverage may be combined with another component or another functional food exhibiting a function other than the function of the improvement of an immune function to thereby serve as a multi-functional food or beverage.
- the bacterial composition can be incorporated into foods requiring a processing step which may destroy ordinary probiotic strains.
- most commercially usable probiotic strains cannot be incorporated into foods that need to be processed, for example, by heat treatment, long term storage, freezing, mechanical stress, or high-pressure treatment (for example, extrusion forming or roll forming).
- the bacterial composition described herein can be easily incorporated into such processed foods.
- the bacterial composition in the form of spores can survive even in a dried food, and can remain living even after being ingested.
- the bacterial composition can withstand low-temperature sterilization processes, typically processes carried out at a temperature from about 70 °C to about 100 °C, both inclusive.
- the bacterial composition can be incorporated into dairy products that require a pasteurization step.
- the bacterial composition can withstand long-term storage of many years; high-temperature processing such as baking and boiling; low-temperature processing such as freezing and cold storage; and high-pressure treatments such as extrusion forming and roll forming.
- the amount of the bacterial composition to be administered or ingested can be determined empirically, taking into consideration such factors as the age, body weight, gender, symptoms, health conditions, of an individual who will receive it, as well as the kind of bacterial composition (a pharmaceutical product, a food or beverage) to be administered or ingested.
- the amount per administration or ingestion is generally 0.01 mg/kg body weight to 100 mg/kg body weight, and, in specific embodiments, 1 mg/kg body weight to 10 mg/kg body weight.
- Also described herein is a method for suppressing the immunity (reducing the immune response) of a subject, the method being characterized in that the bacteria belonging to the Clostridia class or the physiologically active substance derived from the bacteria is administered to or ingested by the subject as described above.
- the bacterial composition may be administered to an individual once, or it may be administered more than once. If the composition is administered more than once, it can be administered on a regular basis (for example, once a day, once every two days, once a week, once every two weeks, once a month, once every 6 months, or once a year) or on an as needed or irregular basis.
- the appropriate frequency of administration (which may depend on host genetics, age, gender, and health or disease status of the subject, among other factors) may be determined empirically.
- a patient can be administered one dose of the composition, and the levels of the bacterial strains of the composition in fecal samples obtained from the patient can be measured at different times (for example after 1 day, after 2 days, after 1 week, after 2 weeks, after 1 month). When the levels of the bacteria fall to, for example, one half of their maximum value, a second dose can be administered, and so on.
- a product comprising the bacterial composition (a pharmaceutical product, a food or beverage, or a reagent) or a manual thereof may be accompanied by document or statement explaining that the product can be used to suppress the immunity (including a statement that the product has an immunosuppressive effect and a statement that the product has an effect of suppressing the proliferation or function of effector T-cells).
- the "provision to the product or the manual thereof with the note” means that the document or statement is provided to a main body, a container, a package, or the like of the product, or the note is provided to a manual, a package insert, a leaflet, or other printed matters, which disclose information on the product.
- administration of the bacterial composition to an individual makes it possible to induce proliferation or accumulation of regulatory T cells in the individual.
- This provides a method of inducing proliferation or accumulation of regulatory T cells in an individual, the method comprising: administering, to the individual, at least one substance selected from the group consisting of: (a) Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- the bacterial composition is administered (provided) to the individual in sufficient quantity to produce the desired effect of inducing proliferation, accumulation or both proliferation and accumulation of regulatory T cells. It may be administered to an individual in need of treatment, reduction in the severity of or prevention of at least one disease selected from an autoimmune disease, an inflammatory disease, an allergic disease, and an infectious disease.
- the "individual” or “subject” may be in a healthy state or a diseased state.
- the method may further comprise the optional step of administering at least one (a, one or more) antibiotic preceding, or in combination with, the bacterial composition.
- the antibiotic administered can be, for example, one which facilitates recolonization of the gut by Gram-positive bacteria of the Clostridia class, such as an antibiotic that reduces Gram-negative bacteria.
- antibiotics examples include aminoglycoside antibiotics (amikacin, gentamicin, kanamycin, neomycin, netilmicin, tobramycin, and paromomycin), cephalosporin antibiotics (cefaclor, cefamandole, cefoxitin, cefprozil, cefuroxime, cefixime, cefdinir, cefditoren, cefoperazone, cefotaxime, ceftazidime, ceftibuten, ceftizoxime, ceftriaxone, and cefoxotin), sulfonamides, ampicillin, and streptomycin.
- aminoglycoside antibiotics amikacin, gentamicin, kanamycin, neomycin, netilmicin, tobramycin, and paromomycin
- cephalosporin antibiotics cefaclor, cefamandole, cefoxitin, cefprozil, cefuroxime, cefix
- a prebiotic composition such as almond skin, inulin, oligofructose, raffinose, lactulose, pectin, hemicellulose (such as xyloglucan and alpha-glucans), amylopectin, and resistant starch which are not decomposed in the upper gastrointestinal tract and promote the growth of intestinal microbes in the intestinal tract, as well as growth factors such as acetyl-Co A, biotin, beet molasses, and yeast extracts, preferentially contributes to the proliferation of the bacterial species in the composition belonging to the Clostridia class.
- a method of inducing proliferation and/or accumulation of regulatory T cells in an individual can comprise administering, to the individual, at least one substance selected from the above in combination with the bacterial composition.
- a composition comprising the bacterial composition and a prebiotic [00] composition.
- a therapeutic composition may be administered to an individual together with at least one substance selected from the group consisting of the bacterial composition, an antibiotic, and a prebiotic composition or growth factor.
- a therapeutic composition can be, for example, one therapeutic composition selected from the group consisting of corticosteroids, mesalazine, mesalamine, sulfasalazine, sulfasalazine derivatives, immunosuppressive drugs, cyclosporin A, mercaptopurine, azathiopurine, prednisone, methotrexate, antihistamines, glucocorticoids, epinephrine, theophylline, cromolyn sodium, anti-leukotrienes, anti-cholinergic drugs for rhinitis, anti-cholinergic decongestants, mast-cell stabilizers, monoclonal anti-IgE antibodies, vaccines (preferably, vaccines used for vaccination where the amount of an allergen is gradually increased), anti-TNF inhibitors such as infliximab, adalimumab, certolizumab pegol, golimumab, or etanercept, and combinations
- the therapeutic composition with at least one substance selected from the group consisting of the bacterial composition, the "antibiotic”, and the "prebiotic composition or growth factor".
- the "one substance” and the therapeutic composition are administered orally or parenterally to an individual simultaneously or sequentially/individually at any appropriate time.
- Whether administration of the bacterial composition induces the proliferation and/or accumulation of regulatory T cells can be determined by using, as an index, increase or reinforcement of at least one of the following: the number of regulatory T cells, the ratio of regulatory T cells in the T cell group of the colon, a function of regulatory T cells, or expression of a marker of regulatory T cells.
- a specific approach is measurement counts or percentage of Foxp3-expressing Tregs in a patient sample, such as a biopsy or a blood sample, promotion (enhancement) of IL-10 expression, promotion (enhancement) of CTLA4 expression, promotion (enhancement) of IDO expression, suppression of IL-4 expression, or colonization of an individual with the bacterial composition administered as the index of the induction of proliferation or accumulation of regulatory T cells.
- Methods for detecting such expression include northern blotting, RT-PCR, and dot blotting for detection of gene expression at the transcription level; ELISA, radioimmunoassays, immunoblotting, immunoprecipitation, and flow cytometry for detection of gene expression at the translation level.
- Samples that may be used for measuring such an index include tissues and fluids obtained from an individual, such as blood, obtained in a biopsy, and a fecal sample.
- an amount e.g. count
- Clostridium saccharogumia Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- Clostridiales bacterium 1_7_47FAA, Blautia cocoides, Anaerostipes caccae DSM 14662 in a patient's sample is determined.
- a patient's sample e.g. a colonic biopsy or a fecal sample
- a base line value obtained by performing a similar determination on a healthy individual (e.g., an individual who does not have/has not been identified as having a disease or condition for which the bacterial composition is a potential treatment such as an auto-immune disease, an allergic condition, cancer, organ rejection)
- a healthy individual e.g., an individual who does not have/has not been identified as having a disease or condition for which the bacterial composition is a potential treatment such as an auto-immune disease, an allergic condition, cancer, organ rejection
- This determination can be used, for example, by a clinician to determine whether an individual or a patient is likely to benefit from treatment with the bacterial composition, or to select an individual or a patient for inclusion in a clinical trial. The clinician can then administer the bacterial composition to the individual or patient based on the determination that the individual or patient is likely to benefit from treatment.
- This determination can also be used as a method to monitor an individual's response to treatment with the bacterial compositions described, wherein a higher value of the determination after treatment with the bacterial composition (compared to a determination before treatment) indicates that the individual has responded favorably to treatment (e.g. is a positive indicator of successful colonization and enhanced immunosuppression in the individual).
- the prognosis and monitoring methods described here may further comprise the step of measuring in the individual's samples the percentages or absolute counts of other commensal species belonging to Clostridium Clusters IV and XIVa that are not present in the bacterial composition, wherein lower than baseline values before treatment indicate a higher likelihood of a positive response to treatment, and wherein an increased value after treatment indicates that the individual has responded favorably to treatment.
- a variety of known methods can be used for determining the composition of the microbiota. For example, 16S rRNA sequencing can be used
- the bacterial composition can also be used as an adjuvant to improve the efficacy of a vaccine formulation.
- the bacterial composition can be used as an adjuvant to a vaccine for the prophylaxis or treatment of an autoimmune disease or an allergic disease (for example, as an adjuvant for a vaccination protocol where the amount of an allergen is gradually increased).
- Example of autoimmune diseases and allergic diseases include those described as the "specific examples of target diseases" in ⁇ Composition Having Effect of Inducing Proliferation or Accumulation of Regulatory T cells>.
- the bacterial composition can also be administered to an individual who is also receiving antibiotic treatment.
- antibiotics that act against Gram+ bacteria such as vancomycin or metronidazole
- vancomycin or metronidazole can effectively eliminate or greatly reduce bacterial species belonging to the Clostridia class from the gastrointestinal tract of mammals and subsequently decrease the levels of regulatory T cells (Example 5, Fig. 30).
- the key role of bacteria belonging to the Clostridia class in preserving immune tolerance strongly indicates that their absence or reduced levels can play a key role in autoimmune diseases characterized by failures of immune tolerance. Accordingly, individuals undergoing courses of antibiotics against Gram+ bacteria (for example, individuals being treated for infections with pathogens such as C.
- the bacterial composition can be administered before, simultaneously with, or after the antibiotic treatment, but preferably it is administered simultaneously or after the antibiotic treatment.
- the bacterial composition is preferably administered in spore form, to improve its resistance to residual antibiotics.
- Antibiotics against Gram-positive bacteria include, but are not limited to, vancomycin, metronidazole, linezolid, ramoplanin, fidaxomicin, cephalosporin antibiotics (cephalexin, cefuroxime, cefadroxil, cefazolin, cephalothin, cefaclor, cefamandole, cefoxitin, cefprozil, and ceftobiprole); fluoroquinolone antibiotics (cipro, Levaquin, floxin, tequin, avelox, and norflox); tetracycline antibiotics (tetracycline, minocycline, oxytetracycline, and doxycycline); penicillin antibiotics (amoxicillin, ampicillin, penicillin V, dicloxacillin, carbenicillin, vancomycin, and methicillin); and carbapenem antibiotics (ertapenem, doripenem, imipenem/cilastatin, and meropen
- a method of obtaining bacteria capable of inducing Tregs comprising (1) isolating the bacterial spore-forming fraction from a fecal or biopsy sample obtained from a mammal, preferably a human (e.g. by chloroform treatment or by heat treatment), (2) optionally, orally administering the spore-forming fraction to a non-human mammal, preferably a germ-free non-human mammal; (3) optionally, obtaining a fecal sample from the non-human mammal, diluting the fecal sample (for example diluting it by volume by a factor of 10, 100, 1,000, or 10,000), thereby producing a diluted fecal sample, and orally administering the diluted sample to a second germ-free non-human mammal, wherein optional step (3) can be repeated more than one time, (4) plating serial dilutions, under aerobic condition or strictly anaerobic conditions, of either the spore-forming fraction obtained in (1) or a sample of intestinal
- mice used in Examples were prepared or produced as follows. In the following description, mice may be referred to as "SPF” or "GF". These "SPF” and “GF” indicate that the mice were maintained in the absence of specific pathogenic bacteria (specific pathogen-free, SPF), and that the mice were maintained under Germ-Free (GF) conditions, respectively.
- SPF specific pathogenic bacteria
- GF Germ-Free
- C57BL/6, Balb/c, and IQI mice maintained under SPF or GF conditions were purchased from Sankyo Labo Service Corporation, Inc. (Japan), JAPAN SLC, INC. (Japan), CLEA Japan, Inc. (Japan), or The Jackson Laboratory (USA).
- GF mice and gnotobiotic mice were bred and maintained within the gnotobiotic facility of The University of Tokyo, Yakult Central Institute for Microbiological Research, or Sankyo Labo Service Corporation, Inc.
- Myd88 -/- , Rip2 -/- , and Card9 -/- mice were produced as described in NPL 1 to 3, and backcrossed for 8 generations or more, so that a C57BL/6 genetic background was achieved.
- Foxp3 eGFP mice were purchased from the Jackson Laboratory.
- a targeting construct was first created. Specifically, a cassette (IRES-Venus-SV40 polyA signal cassette, refer to Non-Patent Document 4) which was made of an internal ribosome entry site (IRES), a yellow fluorescent protein (Venus), and a SV40 polyA signal (SV40 polyA) and which was arranged next to a neomycin-resistant gene (neo), was inserted between a stop codon and a polyA signal (Exon 5) of a Il10 gene. Next, the obtained targeting construct was used to cause homologous recombination with the Il10 gene region in the genome of mice.
- a cassette (IRES-Venus-SV40 polyA signal cassette, refer to Non-Patent Document 4) which was made of an internal ribosome entry site (IRES), a yellow fluorescent protein (Venus), and a SV40 polyA signal (SV40 polyA) and which was arranged next to a neomycin-resistant gene (neo), was
- Il10 venus mice having an Il10 venus alleles were produced (refer to Fig. 1 ).
- tk represents a gene coding thymidine kinase
- neo represents the neomycin-resistant gene
- BamH1 represents a cleavage site by the restriction enzyme BamH1.
- Genomic DNAs were extracted from the IL10 venus mice, treated with BamH1, and Southern blotted by use of a probe shown in Fig. 1 .
- Fig. 2 shows the obtained results. Wild-type and Il10 venus alleles were detected as bands having sizes of 19 kb and 5.5 kb, respectively. Hence, as is apparent from the results obtained, the homologous recombination occurred in the genome of the Il10 venus mice.
- CD4+ Venus- cells or CD4+ Venus+ cells in the colonic lamina intestinal of the Il10 venus mice were sorted by use of a FACSAria. Then, real-time RT-PCR was carried out on an ABI 7300 system by a method to be described later, to determine the amount of IL-10 mRNA expressed. It was found that, since the development of the IL-10 mRNA was detected only in the CD4 + Venus + cells, the expression of IL-10 mRNA in the Il10 venus mice was correctly reflected in the expression of Venus. Note that the germ-free states of such Il10 venus mice were established in Central Institute for Experimental Animals (Kawasaki, Japan). The Il10 venus mice in the germ-free states were maintained in vinyl isolators in Sankyo Labo Service Corporation, Inc. (Tokyo, Japan), and used in the following Examples.
- mice in which SFB or Clostridium were colonized were produced.
- Cecal contents or feces of the obtained gnotobiotic mice were dissolved in sterile water or an anaerobic dilution solution.
- the dissolved cecal contents or feces as they were or after a chloroform treatment were orally administered to GF mice.
- Three strains of the Lactobacillus and 16 strains of the Bacteroides were cultured separately from each other in a BL or EG agar medium in an anaerobic manner.
- the cultured bacteria were harvested, suspended in an anaerobic TS broth, and orally administrated forcibly to GF mice.
- the state of the colonization of the bacteria in the mice was assessed by microscopic observation conducted on a smear preparation of fecal pellets.
- the small intestine and colon were collected and opened longitudinally.
- the cecum was also isolated and cecal content was directly frozen at -80°C or suspended in 2 ml PBS, then added 40% glycerol (final concentration 20%), snap-frozen in liquid nitrogen and stored at -80 °C until use.
- the colon and small intestine were washed in PBS to remove all luminal contents and shaken in Hanks' balanced salt solution (HBSS) containing 5 mM EDTA for 20 min at 37 °C.
- HBSS Hanks' balanced salt solution
- the lamina propria layers were cut into small pieces and incubated with RPMI1640 containing 4% fetal bovine serum, 1 mg/ ml collagenase D, 0.5 mg/ml dispase and 40 micro gram/ml DNase I (all Roche Diagnostics) for 1 h at 37 °C in a shaking water bath.
- the digested tissues were washed with HBSS containing 5 mM EDTA, resuspended in 5 ml of 40% Percoll (GE Healthcare) and overlaid on 2.5 ml of 80% Percoll in a 15-ml Falcon tube.
- Percoll gradient separation was performed by centrifugation at 800 g for 20 min at 25 °C.
- the lamina basement lymphocytes were collected from the interface of Percoll gradient and suspended in ice-cold PBS.
- isolated lymphocytes were labeled with the LIVE/DEAD fixable violet dead cell stain kit (Invitrogen) to exclude dead cells in the analysis.
- the cells were washed with staining buffer containing PBS, 2% FBS, 2 mM EDTA and 0.09% NaN3 and stained surface CD4 with PECy7-labeled anti-CD4 Ab (RM4-5, BD Biosciences).
- Intracellular staining of Foxp3 and Helios was performed using the Alexa700-labeled anti-Foxp3 Ab (FJK-16s, eBioscience), Alexa647-labeled anti-Helios (22F6, eBioscience) and Foxp3 Staining Buffer Set (eBioscience).
- FJK-16s Alexa700-labeled anti-Foxp3 Ab
- Alexa647-labeled anti-Helios 22F6, eBioscience
- Foxp3 Staining Buffer Set eBioscience.
- Th1 and Th17 cells isolated lymphocytes were stimulated for 4 hours with 50 ng/ml phorbol 12-myristate 13-acetate (PMA, Sigma) and 1 micro gram/ml ionomycin (Sigma) in the presence of GolgiStop (BD Biosciences).
- RNA prepared by using RNeasy Mini Kit Qiagen
- a cDNA was synthesized by use of a MMV reverse transcriptase (Promega KK).
- the cDNA obtained was analyzed by real-time RT-PCR using Power SYBR Green PCR Master Mix (Applied Biosystems) and ABI 7300 real time PCR system (Applied Biosystems),or real-time RT-PCR using SYBR Premix Ex Taq (TAKARA) and Light Cycler 480.
- TAKARA SYBR Premix Ex Taq
- Light Cycler 480 For each sample, a value obtained was normalized for the amount of GAPDH.
- a primer set was designed by using Primer Express Version 3.0 (Applied Biosystems), and those exhibiting a 90% or higher sequence identity at an initial evaluation were selected. The primer set used was as follows:
- the colon was collected, cut open longitudinally, and rinsed with PBS. Subsequently, the colon was treated with ImM dithiothreitol (DTT) at 37 °C for 30 minutes on a shaker, and then vortexed for one minute to disrupt the epithelial integrity.
- DTT ImM dithiothreitol
- the released intestinal epithelial cells (IECs) were collected, and suspended in 5 ml of 20% percoll. The suspension was overlayered on 2.5 ml of 80% percoll in a 15-ml Falcon tube. Then, the tube was centrifuged at 25 °C and 780 g for 20 minutes to conduct cell separation by percoll density gradient centrifugation.
- IECs obtained collected were suspended in RPMI containing 10% FBS, and 1 x 10 5 cells of the IECs were cultured in a 24-well plate for 24 hours. Thereafter, the culture supernatant was collected, and measured for active TGF- beta 1 level by ELISA (Promega).
- a fecal suspension from Clostridium-colonized mice was orally administered to C57BL/6 mice (2-week old), which were grown in a conventional environment for six weeks.
- mice were presensitized by transdermally applying, onto the mice, 150 micro liter of a 3% oxazolone (4-ethoxymethylene-2-phenyl-2-oxazolin-5-one, Sigma-Aldrich)/100% ethanol solution.
- 150 micro liter of a 1% oxazolone/50% ethanol solution was intrarectally administered again to the presensitized mice under a light anesthesia. Note that the intrarectal administration was conducted by using a 3.5F catheter.
- Each mouse was analyzed daily for body weight, occult blood, bleeding visible with the naked eyes (gross blood), and the hardness of stool. Moreover, the body weight loss percentage, intestinal bleeding (no bleeding, occult blood (hemoccult+), or bleeding visible with the naked eyes), and the hardness of stool (normal stool, loose stool, or diarrhea) were evaluated numerically, and the disease activity index (DAI) was calculated in accordance with the description in " S. Wirtz, C. Neufert, B. Weigmann, M. F. Neurath, Nat Protoc 2, 541 (2007 )."
- mice BALB/c SPF mice were inoculated with a fecal suspension from Clostridium-colonized mice (2-week old), and grown in a conventional environment. Then, 1 micro gram of OVA (grade V, Sigma) and 2 mg of alum (Thermo Scientific), 0.2 ml in total, were intraperitoneally injected to the mice (at their ages of 4 weeks and 6 weeks). Sera were collected every week from the mice at the root of their tail, and OVA-specific IgE was measured by ELISA (Chondrex).
- splenic cells were collected, inoculated in a 96-well plate at 1 x 10 6 cells per well, and stimulated with OVA (100 micro gram/ml) for three days. Thereafter, the culture supernatant was collected, and measured for IL-4 and IL-10 levels by ELISA (R&D).
- control and experimental groups were evaluated by the Student's t-test.
- Human stool (2g) from a healthy volunteer (Japanese, male, 29y old) was suspended with 20ml phosphate-buffered saline (PBS) and passed through a 70 micro meter cell strainer to eliminate clumps and debris. Then fecal suspension was mixed with or without chloroform (final concentration 3%), and incubated in a shaking water bath for 60 min. The fecal suspensions without chloroform treatment were orally inoculated into germ-free (GF) mice (250 micro liter/mouse). After evaporation of chloroform by bubbling with N2 gas for 30 min, the aliquots containing chloroform-resistant (spore-forming) fraction of human intestinal bacteria were inoculated into IQI GF mice. Each group of ex-GF mice was separately kept in a vinyl isolator for 3 or 4 weeks.
- PBS phosphate-buffered saline
- IQI GF mice were co-housed for 4 weeks with ex-GF mice colonized with chloroform-treated human feces (Example 21 mice) in a vinyl isolator (6 mice, designated as mouse #D1 to #D6
- the frozen cecal content from ex-GF mice inoculated with chloroform-treated human feces was suspended in 10 times volume (w/v) of PBS, passed through a 70 micro meter cell strainer and treated 3% chloroform. Then the suspension was diluted 2000 (for 4 mice, designated as mouse #E1 to #E4) or 20000 (for 8 mice, designated as mouse #F1 to #F8) -fold with PBS and orally inoculated into GF IQI mice (2.5x10 5 or 2.5x10 4 cells/250 micro liter/mouse). After 4 weeks, lymphocytes were collected from colon and small intestine and analyzed for Foxp3+ Treg cell proportion and their Helios expression. Cecal contents were frozen and stored at -80 °C until use.
- the frozen cecal content from ex-GF mice inoculated with 20000-fold dilution was suspended in 10 times volume (w/v) of PBS, passed through a 70 micro meter cell strainer and treated 3% chloroform.
- the suspensions were orally inoculated into GF IQI mice (5, 4 or 4 mice; designated as mouse #G1 to #G5, #H1 to #H4 or #11 to #14, respectively).
- colon and small intestine were collected and analyzed for Foxp3+ Treg cell proportion and their Helios expression.
- Cecal contents were suspended in 20% glycerol solution, snap-frozen in liquid nitrogen and stored at - 80 °C.
- mice The glycerol stock of cecal content from #G2 mouse was diluted with PBS and seeded onto BL agar plate. After 48 hours, all bacterial colonies were collected by scraping the plates with a plate scraper and inoculated into GF IQI mice (4 mice, designated as mouse #K1 to #K 4). Six bacterial strains were isolated from the freeze stock of cecal content from #F8 mouse using BL agar plate. These isolated strains were inoculated into GF IQI mice (4 mice, designated as mouse #J1 to #J4). (Details of the culture method are described below.)
- bacterial genomic DNA was isolated from the human stool from a healthy volunteer as described above (human stool), cecal contents from GF mice gavaged with chloroform-treated human stool (cecal content of B-4 mouse) or feces from SPF ICR mouse (feces of SPF mouse).
- the isolated DNA was used as template for quantitative PCR.
- the amplification program consisted of one cycle at 95°C for 1 min, followed by 50 cycles at 95°C for 10 s and 60 °C for 30 s.
- Quantitative PCR analysis was carried out using a LightCycler 480 (Roche). Relative quantity was calculated by the delta Ct method and normalized to the amount of total bacteria.
- the following primer sets were used: total bacteria, 5'-GGTGAATACGTTCCCGG-3'(SEQ ID NO.: 45) and 5'-TACGGCTACCTTGTTACGACTT-3'(SEQ ID NO.: 46); Clostridium cluster XIVa (Clostridium coccoides subgroup), 5'-AAATGACGGTACCTGACTAA-3' (SEQ ID NO.: 47) and 5'-CTTTGAGTTTCATTCTTGCGAA-3'(SEQ ID NO.: 48); Clostridium cluster IV (Clostridium leptum) 5'-CCTTCCGTGCCGSAGTTA-3'(SEQ ID NO.: 49) and 5'-GAATTA AACCACATACTCCACTGCTT-3'(SEQ ID NO.: 50); Bacteroides, 5'-GAGAGGAAGGTCCCCCAC-3'(SEQ ID NO.: 51) and 5'-CGCTACTTGGCTGGTTCAG-3'(SEQ ID NO.: 52); Bifidobacterium
- mice gavaged with chloroform-treated human stool exhibited high levels of spore-forming bacteria, such as Clostridium clusters XIVa and IV, and a severe decrease of non-spore-forming bacteria, such as Bacteroides and Bifidobacterium, compared with the human stool before chloroform treatment.
- spore-forming bacteria such as Clostridium clusters XIVa and IV
- non-spore-forming bacteria such as Bacteroides and Bifidobacterium
- Bacterial strains were isolated from the cecal contents of #F8, #G2, #11 and #K3 by plating serial dilutions of the cecal samples under aerobic condition or strictly anaerobic conditions (80% N2 10% H2 10% CO2) onto BL agar (Eiken Chemical) or EG agar plates containing medium with the following components (quantities expressed per liter): Meat extract 500 ml; Proteose peptone No.3 (10.0 g, Difco); Yeast Extract (5.0 g, Difco); Na2HPO4 (4.0 g); D(+)-Glucose (1.5 g); Soluble Starch (0.5 g); L-cystine (0.2 g), L-cysteine-HCl-H2O (0.5g); Tween80 (0.5 g); Bacto Agar (16.0 g, Difco); defibrinated horse blood (50 ml).
- TS medium (27.5g of trypticase soy broth w/o dextrose, 0.84 g of Na2CO3, 0.5 g of L-cysteine-HCl-H2O, 1000 ml of distilled water, pH adjusted to 7.2 +/- 0.2 with NaOH, then autoclaved for 15 minutes at 115 degrees Celsius).
- 16SrRNA coding gene sequences were performed.
- the 16S rRNA genes were amplified by colony-PCR using KOD FX (TOYOBO), 16S rRNA gene-specific primer pairs: 8F (5'-AGAGTTTGATCMTGGCTCAG-3'(SEQ ID NO.: 57)) and 519R (5'-ATTACCGCGGCKGCTG-3'(SEQ ID NO.: 58)) for C. indolis, C. bolteae, Bacteroides sp. MANG, L. bacterium DJF_VP30, A.colihominis, Ruminococcus sp. ID8, C. lavalense, C. symbiosum and E. contortum or 1513R
- Each amplified DNA was purified from the reaction mixture using Illustra GFX PCR DNA and Gel Band Purification Kit (GE Healthcare). Sequence analysis was performed using BigDye Terminator V3.1 Cycle Sequencing Kit (Applied Biosystems) and Applied Biosystems 3730x1 DNA analyzer (Applied Biosystems). The resulting sequences were compared with sequences in nucleic acid databases using BLAST to determine the closest relatives. The closest relatives and % identity of all isolated strains, information for genus-species of the closest relatives, Clostridium cluster, ID of mouse from which was derived, maximum similarity and culture medium of isolated strains were summarized in Table 2.
- Example 1 First, it was investigated whether or not accumulation of regulatory T cells (Treg cells) in the colonic lamina intestinal was dependent on commensal bacteria. Specifically, lymphocytes were isolated from peripheral lymph nodes (pLN) of Balb/c mice bred in the absence of specific pathogenic bacteria (SPF) or from lamina intestinal of the colon or the small intestine (SI) of the mice. The CD4 and Foxp3 were stained by antibodies. Then, the ratio of Foxp3 + cells in CD4 + lymphocytes was analyzed by flow cytometry.
- SPPF peripheral lymph nodes
- SI small intestine
- Example 2 Next, it was investigated whether or not the temporal accumulation of the Treg cells in the colon as found in Example 1 had a relationship with the colonization of intestinal commensal microbiota. Specifically, the expression of CD4 and the expression of Foxp3 in lymphocytes isolated from the small intestine, the colon, and the peripheral lymph nodes of mice bred under a germ-free (GF) or SPF environment (8 weeks old: Balb/c mice, IQI mice, and C57BL/6 mice) were analyzed. Similar results were obtained in three or more independent experiments.
- GF germ-free
- SPF environment 8 weeks old: Balb/c mice, IQI mice, and C57BL/6 mice
- lamina propria lymphocytes were collected from SPF mice and GF mice (Balb/c mice or C57BL/6 mice). CD4 and Foxp3 were stained with antibodies. Then, the lamina limbal lymphocytes were analyzed by FACS.
- lymphocytes were isolated from the lamina intestinal of the colon, the lamina intestinal of the small intestine (SI), Peyer's patches (PPs), and mesenteric lymph nodes (MLNs) of mice (SPF C57BL/6 mice) to which antibiotics were orally administered with water for eight weeks.
- CD4 and Foxp3 were stained with antibodies.
- the lymphocytes were analyzed by FACS. Similar results (the ratio of the Foxp3 + cells in the CD4 + cells of an individual mouse) were obtained in two or more independent experiments. Note that the following antibiotics were used in combination in accordance with the description in the following document:
- Example 3 Next, it was directly checked whether or not the decrease in the number of the Treg cells in the colonic lamina intestinal lamina intestinal of the GF mice shown in Example 2 was attributed to the absence of microbiota. Specifically, a fecal suspension of B6 SPF mice purchased from The Jackson Laboratory was orally administered to GF-IQI mice (conventionalization). Three weeks after the administration, lymphocytes were isolated from the colonic lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina basement was not change. However, the number of the Treg cells in the colonic lamina basement increased significantly. Hence, it was shown that host-microbial interaction played an important role in the accumulation of Foxp3 + Treg cells in the colonic lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina intestinal lamina
- Example 4 Next, the relationship between the gut-associated lymphoid tissues of mice and the number of Foxp3 + cells in the colonic lamina intestinal of the mice was investigated in accordance with the method described in M. N. Kweon et al., J Immunol 174, 4365 (Apr 1, 2005 ). Specifically, 100 micro gram of an extracellular domain recombinant protein (a fusion protein (LT beta R-Ig) between a lymphotoxin beta receptor (LT beta R) and a Fc region of human IgG1, refer to Honda et al., J Exp Med 193, 621 (Mar 5, 2001 )) was injected intraperitoneally into pregnant C57BL/6 mice 14 days after conception.
- a fusion protein LT beta R-Ig
- LT beta R lymphotoxin beta receptor
- the LT beta R-Ig was again injected intraperitoneally into fetuses obtained from such mice, so that mice from which isolated lymphoid follicles (ILFs), Peyer's patches (PPs), and colonic-patches (CPs) were completely removed were produced. Then, the ratios of Foxp3 + cells in CD4 + cells in the colonic lamina intestinal of the mice treated with the LT beta R-Ig, and mice treated with rat IgG (control) were analyzed by FACS.
- IPFs isolated lymphoid follicles
- PPs Peyer's patches
- CPs colonic-patches
- Example 5 To investigate whether or not a specific intestinal flora induced the accumulation of colonic Treg cells, vancomycin as an antibiotic against Gram-positive bacteria or polymyxin B as an antibiotic against Gram-negative bacteria was administered to SPF mice (from 4 weeks of age) for four weeks, and analyzed for the ratio of Foxp3 + cells in the CD4 + cell group ([%] Foxp3 + in CD4).
- Example 6 A recent report has suggested that spore-forming bacteria play an important role in intestinal T cells response (see V. Gaboriau-Routhiau et al., Immunity 31, 677 (Oct 16, 2009 )).
- fecal microorganisms spore-forming fraction
- 3% chloroform were orally administered to GF mice, which were then analyzed for the ratio of Foxp3+ cells in the CD4+ cell group ([%] Foxp3+ in CD4).
- the number of Treg cells in the administered mice was markedly increased to the same level as those of the SPF mice and the GF mice to which the untreated feces was forcibly administered.
- Example 5 it was revealed that the specific components of the indigenous microbiota were highly likely to belong to the Gram-positive group, and that the spore-forming fraction played an important role in the induction of Treg cells.
- Example 7 Next, the species of the intestinal microbiota which induced the accumulation of Treg cells in the colon as suggested in Examples 4 to 6 were identified. Specifically, segmented filamentous bacteria (SFB), 16 strains of the Bacteroides spp. (Bactero. (6 strains of B. vulgatus, 7 of the B. acidifaciens group 1, and 3 of the B. acidifaciens group 2)), 3 strains of the Lactobacillus (Lacto. (L. acidophilus. L. fermentum, and L. murinum )), and 46 strains of Clostridium spp. (Clost., refer to " Itoh, K., and Mitsuoka, T.
- mice Characterization of clostridia isolated from faeces of limited flora mice and their effect on caecal size when associated with germ-free mice. Lab. Animals 19: 111-118 (1985 ))"), or microbiota collected from mice (SPF) bred under a conventional environment was orally administered to GF-Balb/c mice or GF-IQI mice. The mice were maintained in vinyl isolators for three weeks. Then, CD4 cells were isolated from the colon and the small intestine of these mice. The numbers of Treg cells in the colon and the small intestine were analyzed by flow cytometry.
- the bacteria belonging to the genus Clostridium are classified by sequencing of 16S rRNA gene, as follows. Specifically, the 16S rRNA genes of the bacteria were amplified by PCR using 16S rRNA gene-specific primer pairs: 5'-AGAGTTTGATCMTGGCTCAG-3' (SEQ ID NO: 60) and 5'-ATTACCGCGGCKGCTG-3' (SEQ ID NO: 61) (see T. Aebischer et al., Vaccination prevents Helicobacter pylori-induced alterations of the gastric flora in mice. FEMS Immunol. Med. Microbiol. 46,221-229(2006 )). The 1.5-kb PCR product was then introduced into pCR-Blunt Vector.
- the inserts were sequenced and aligned using the ClustalW software program.
- the resulting sequences of 16S rRNA genes derived from strain 1-41 of 46 strains of Clostridium spp. were shown in SEQ ID NO: 21-61.
- a phylogenetic tree was constructed by the neighbor-joining method with the resulting sequences of the 41 strains of Clostridium and those of known bacteria obtained from Genbank database using Mega software.
- mice in which the segmented filamentous bacteria (SFB) were colonized gave similar results.
- the accumulation of Foxp3+ cells in the colonic lamina intestinal was strongly induced in the mice in which 46 strains of Clostridium spp. were colonized.
- such accumulation was promoted irrespective of the genetic backgrounds of the mice, and led to the increase in number similar to that in the SPF mice although intestinal microbiota of only a single genus were colonized.
- Example 8 Next, CD4 expression, Foxp3 expression, and Helios expression in LP lymphocytes of the thymuses and the colons of SPF mice, GF mice, Lactobacillus-colonized mice, and Clostridium-colonized mice were analyzed by flow cytometry.
- Example 9 Next, it was investigated whether or not the colonization of the Clostridium or the like had an influence on other T cells. Specifically, SFB, 16 strains of Bacteroides spp. (Bactero.), 46 strains of Clostridium spp. (Clost.), or microbiota collected from mice bred under a conventional environment (SPF) was colonized in GF IQI mice. Three weeks later, lymphocytes in the colonic lamina intestinal were isolated from these mice, and stimulated with PMA (50 ng/ml) and ionomycin (1 micro gram/ml) for four hours in the presence of Golgistop (BD Bioscience).
- PMA 50 ng/ml
- ionomycin (1 micro gram/ml
- Example 10 It has been reported that 46 strains of Clostridium spp. exert an influence on the accumulation of CD8 + intestinal tract intraepithelial lymphocytes (IELs) in the colon. Accordingly, it is conceivable that Clostridium regulates the immune system in various aspects, and that Clostridium exhibits a marked ability to induce and maintain Treg cells especially in the colon, as described above. In addition, a kind of cytokines, transforming growth factor- beta (TGF- beta), is known to play an important role in regulation of Treg cell generation.
- TGF- beta transforming growth factor- beta
- intestinal epithelial cells IECs
- Clostridium-colonized mice were cultured for 24 hours, and the culture supernatants thereof were measured for the concentration of active TGF- beta (TGF- beta 1) by ELISA (the number of mice analyzed was four per group).
- TGF- beta was detected in the culture supernatant of the IECs isolated from the Clostridium-colonized mice, whereas no TGF- beta was detected in the culture supernatant of the IECs isolated from the GF mice.
- splenic CD4+T cells were cultured for five days together with a 50% conditioned medium in which IECs isolated from the GF mice or the Clostridium-colonized mice were cultured, and with the anti-CD3 antibody, in the presence or absence of an anti-TGF- beta antibody. Then, the T cells were collected, and analyzed for expression of Foxp3 by real-time RT-PCR.
- MMP2, MMP9, and MMP13 which are thought to contribute to the activation of latent TGF- beta was investigated.
- IDO indoleamine 2,3-dioxygenase
- 46 bacterial strains of the genus Clostridium (Clost.), or three bacterial strains of the genus Lactobacillus (Lacto.) were orally administered to C57BL/6 germ-free mice. Three weeks after administration, IECs were collected, and analyzed for relative mRNA expression levels of MMP2, MMP9, MMP13, and IDO genes by real-time RT-PCR (the number of mice analyzed was three per group).
- IDO was expressed only in the Clostridium-colonized mice. Accordingly, it was revealed that the Clostridium activated the IECs, and led to the production of TGF- beta and other Treg cell-inducing molecules in the colon.
- Example 11 Next, it was investigated whether or not the Treg cell accumulation induced by the colonization of the Clostridium was dependent on signal transmission by pathogen-associated molecular pattern recognition receptors. Specifically, the numbers of Treg cells in the colonic lamina intestinal of each SPF mice of Myd88 -/- (deficient in Myd88 (signaling adaptor for Toll-like receptor)), Rip 2 -/- (deficient in Rip2 (NOD receptor adaptor)), and Card9 -/- (deficient in Card9 (essential signal transmission factor for Dectin-1 signal transmission)) were examined. In addition, Clostridium spp.
- Example 12 Intestinal tract Foxp3 + Treg cells are known to exert some immunosuppressive functions through IL-10 production (refer to NPL 9). Meanwhile, animals having CD4 + Foxp3 + cells from which IL-10 is specifically removed are known to develop inflammatory bowel disease (refer to NPL 18). In this respect, first, the expression of IL-10 in lymphocytes of various tissues was examined. Specifically, lymphocytes were isolated from various tissues of SPF Il10 venus mice, and the expression of CD4 and the expression of Venus were analyzed by flow cytometry.
- T cell receptor beta chain TCR beta
- Lymphocytes in the colonic lamina intestinal lamina intestinal lymphocytes were isolated from Il10 venus mice.
- the lymphocytes were stimulated with PMA (50 ng/ml) and ionomycin (1 micro gram/ml) for four hours in the presence of Golgistop (BD Bioscience).
- PMA 50 ng/ml
- ionomycin 1 micro gram/ml
- Golgistop Golgistop
- intracellular cytokines were stained by using an anti-IL-17 PE antibody, an anti-IL-4 APC antibody (11B11), and an anti-IFN-g FITC antibody (BD Bioscience) in accordance with the manual of a cytofix/cytoperm kit (BD Bioscience).
- Foxp3+ CD4 + cells and Foxp3 - CD4 + cells were isolated from the spleen (Spl) of Foxp3 eGFP reporter mice, and Venus + cells were isolated from the colonic lamina intestinal and the small intestine (SI) lamina intestinal of Il10 venus mice.
- the obtained cells were analyzed in terms of expression of predetermined genes.
- the gene expression was analyzed by real-time RT-PCR using a Power SYBR Green PCR Master Mix (Applied Biosystems) and an ABI 7300 real time PCR system (Applied Biosystems). Here, the value for each cell was normalized for the amount of GAPDH.
- the Venus + CD4 + T cells expressed Foxp3 and other Treg cell-associated factors such as a cytotoxic T-Lymphocyte antigen (CTLA-4) and a glucocorticoid-induced TNFR-associated protein (GITR), although the Venus + CD4 + T cells showed none of the phenotypes of Th2 (IL-4-producing) and Thl7 (IL-17-producing). It was shown that the expression level of CTLA-4 in the intestinal Venus + cells was higher than that in the splenic GFP + Treg cells isolated from the Foxp3 eGFP reporter mice.
- CTLA-4 cytotoxic T-Lymphocyte antigen
- GITR glucocorticoid-induced TNFR-associated protein
- Example 13 Venus + cells can be classified into at least two subsets, namely, Venus + Foxp3+ double positive (DP) Treg cells and Venus + Foxp3 - Treg cells on the basis of intracellular Foxp3 expression.
- Cells of the latter subset correspond to type 1 regulatory T cells (Tr1) (refer to NPL 8 and 9).
- Tr1 type 1 regulatory T cells
- the Venus + cells (IL-10-producing cells) observed in Example 8 were investigated in terms of the expression of Foxp3.
- antibiotics were orally given with water to five or six Il10 venus mice per group for 10 weeks. The following antibiotics were used in combination.
- Example 14 It was investigated whether or not Venus + cells induced by the genus Clostridium had an immunosuppressive function similar to that of Venus + cells in the colon of SPF mice. Specifically, CD4 + CD25 - cells (effector T cells, Teff cells) isolated from the spleen were seeded in a flat-bottomed 96-well plate at 2 x 10 4 /well, and cultured for three days together with 2 x 10 4 splenic CD11c+ cells (antigen-representing cells) subjected to 30 Gy radiation irradiation treatment, 0.5 micro gram/ml of an anti-CD3 antibody, and a lot of Treg cells.
- CD4 + CD25 - cells effector T cells, Teff cells isolated from the spleen were seeded in a flat-bottomed 96-well plate at 2 x 10 4 /well, and cultured for three days together with 2 x 10 4 splenic CD11c+ cells (antigen-representing cells) subjecte
- CD4 + CD25 - cells were cultured, with [3H]-thymidine (1 micro Ci/well) was added thereto.
- Treg cells used in Example 14 were CD4 + GFP + T cells isolated from the spleen of Foxp3 eGFP reporter mice, or CD4 + Venus + T cells in the colonic lamina intestinal of GF Il10 v enus mice in which Clostridium spp. were colonized or SPF Il10 venus mice. Then, proliferation of the cells was determined based on the uptake amount of [ 3 H]-thymidine, and represented by a count per minute (cpm) value.
- cpm count per minute
- Example 15 Next, the influence of the colonization of a large number of Clostridium on the local immune response and the resultant proliferation of Treg cells were investigated.
- the DSS-induced colitis model was prepared as described above, and the influence on the model mice of the inoculation of the Clostridium and the proliferation of Treg cells was investigated. Specifically, control mice and Clostridium-inoculated mice were treated with 2% DSS, then observed and measured for six days for body weight loss, the hardness of stool, and bleeding, and then were evaluated numerically. In addition, on day 6, the colons were collected, dissected, and analyzed histologically by HE staining.
- mice having a large number of Clostridium hereinafter also referred to as "Clostridium-abundant mice”
- control mice C57BL/6 mice grown in a conventional environment for six weeks and not inoculated with the fecal suspension.
- histological features such as mucosal erosion, edema, cellular infiltration, and crypt loss were less severe in the DSS-treated Clostridium-abundant mice than in the control mice.
- mice and Clostridium-inoculated mice were sensitized with oxazolone, and subsequently the inside of the rectums thereof were treated with a 1% oxazolone/50% ethanol solution. Then, body weight loss was observed and measured. In addition, the colons were dissected, and analyzed histologically by HE staining.
- the results show that the colitis proceeded along with persistent body weight loss in the control mice. Meanwhile, the body weight loss of the Clostridium-abundant mice was reduced. In addition, it was also revealed that portions having histological diseases such as mucosal erosion, edema, cellular infiltration , and hemorrhage were reduced in the colon of the Clostridium-abundant mice.
- Example 16 Next, the influence, on the systemic immune response (systemic IgE production), of the colonization of a large number of Clostridium and the resultant proliferation of Treg cells was investigated. Specifically, as described above, control mice and Clostridium-inoculated mice were immunized by administering alum-absorbed ovalbumin (OVA) twice at a 2-week interval. Then, sera were collected from these mice, and the OVA-specific IgE level thereof was investigated by ELISA. In addition, splenic cells were collected from the mice in each group, and IL-4 and IL-10 production by in-vitro OVA restimulation was investigated.
- OVA ovalbumin
- Results show that the IgE level was significantly lower in the Clostridium-abundant mice than in the control mice. Moreover, the IL-4 production by the OVA restimulation was reduced and the IL-10 production thereby was increased in the splenic cells of the Clostridium-abundant mice sensitized with OVA and alum, in comparison with those of the control mice.
- Example 17 Next, GF Balb/c were colonized with three strains of Clostridium belonging to cluster IV(strains 22, 23 and 32 listed in Fig.49). Three weeks later, colonic Foxp3 + Treg cells were analyzed by FACS. Results show that gnotobiotic mice colonized with three strains of Clostridium showed an intermediate pattern of Treg induction between GF mice and mice inoculated with all 46 strains.
- Example 18 Next, it was investigated whether or not a spore-forming (for example, a chloroform resistant) fraction of a fecal sample obtained from humans had the effect of inducing proliferation or accumulation of regulatory T cells similar to the spore-forming fraction of the fecal sample obtained from mice.
- Human stool from a healthy volunteer Japanese, male, 29years old
- PBS phosphate-buffered saline
- chloroform final concentration 3%
- mice After evaporation of chloroform by bubbling with N 2 gas, the aliquots containing chloroform-resistant (for example, spore-forming) fraction of human intestinal bacteria were orally inoculated into germ-free (GF) mice (IQI, 8 weeks old). The treated mice were kept in a vinyl isolator for 3 weeks. The colon was collected and opened longitudinally, washed to remove fecal content, and shaken in Hanks' balanced salt solution (HBSS) containing 5 mM EDTA for 20 min at 37 °C.
- HBSS Hanks' balanced salt solution
- the colon was cut into small pieces and incubated with RPMI1640 containing 4% fetal bovine serum, 1 mg/ml collagenase D, 0.5 mg/ml dispase and 40 micro gram/ml DNase I (all manufactured by Roche Diagnostics) for 1 hour at 37 °C in a shaking water bath.
- the digested tissue was washed with HBSS containing 5 mM EDTA, resuspended in 5 ml of 40% Percoll (manufactured by GE Healthcare) and overlaid on 2.5 ml of 80% Percoll in a 15-ml Falcon tube.
- Percoll gradient separation was performed by centrifugation at 780 g for 20 min at 25 °C.
- the interface cells were collected and suspended in staining buffer containing PBS, 2% FBS, 2 mM EDTA and 0.09% NaN 3 and stained for surface CD4 with Phycoerythrin-labeled anti-CD4 Ab (RM4-5, manufactured by BD Biosciences).
- Intracellular staining of Foxp3 was performed using the Alexa647-labeled anti-Foxp3 Ab (FJK-16s, manufactured by eBioscience) and Foxp3 Staining Buffer Set (manufactured by eBioscience). The percentage of Foxp3 positive cells within the CD4 positive lymphocyte population was analyzed by flow cytometry.
- Results show that when the spore-forming (for example, the chloroform resistant) fraction of human intestinal bacteria was colonized in GF mice, the accumulation of Foxp3+ regulatory (Treg) cells in the colonic lamina intestinal of the mice was induced.
- spore-forming (for example, the chloroform resistant) fraction of human intestinal bacteria was colonized in GF mice, the accumulation of Foxp3+ regulatory (Treg) cells in the colonic lamina intestinal lamina intestinal bacteria was induced.
- Creg Foxp3+ regulatory
- Quantitative PCR analysis was carried out using a LightCycler 480 (manufactured by Roche). Relative quantity was calculated by the delta Ct method and normalized to the amount of total bacteria, dilution, and weight of the sample. The following primer sets were used:
- Results show that gavaged with chloroform-treated human stool had large amounts of spore-forming bacteria, such as Clostridium clusters XIVa and IV, and a severe decrease of non-spore-forming bacteria, such as Bacteroides, compared with the human stool before chloroform treatment.
- spore-forming bacteria such as Clostridium clusters XIVa and IV
- non-spore-forming bacteria such as Bacteroides
- Example 19 Human stool (2g) from a healthy volunteer (Japanese, male, 29y old) was suspended with 20ml phosphate-buffered saline (PBS), mixed with or without chloroform (final concentration 3%), and incubated in a shaking water bath for 60 min. The chloroform was then evaporated by bubbling with N2 gas for 30 min. The suspensions of untreated human feces (designated as 'huUT') and chloroform-treated human feces (designated as 'huChloro') were orally inoculated into Germ-free (GF) mice (IQI, 8 week old) (250 micro liter/mouse).
- PBS phosphate-buffered saline
- chloroform final concentration 3%
- the suspension of huUT was inoculated into 4 GF mice, which were numbered from #A1 to #A4, and that of huChloro was inoculated into 4 GF mice numbered from #B1 to #B4.
- Such GF mice which were inoculated with suspensions of feces or the like are also referred to as "ex-GF mice” hereinafter.
- Each group of ex-GF mice was separately kept in a vinyl isolator to avoid further microbial contamination.
- the small intestinal and colonic lamina limba lymphocytes from each mouse were separately collected, and examined for the expressions of surface CD4 and intracellular Foxp3, Helios, IL-17 and IFN- gamma by flow cytometry.
- IL-17 and IFN- gamma staining isolated lymphocytes were stimulated in vitro with PMA and ionomycin for 4 hours.
- Foxp3 is the transcription factor essential for the differentiation and function of Treg cells.
- Helios is a member of the Ikaros transcription factor family and Helios- Foxp3+ Treg cells have been suggested to be Treg cells induced in the periphery [so called induced Treg (iTreg) cells].
- iTreg induced Treg
- Example 20 To investigate whether dead bacteria also have an effect on the induction of Treg cells, the suspension of chloroform-treated human feces was autoclaved (121 °C for 20 min) and orally inoculated into GF mice (once a week for 4 weeks). After 4 weeks, mice were sacrificed, and the colonic lamina intestinal lymphocytes from each mouse were examined for the expression of CD4, Foxp3 and Helios by flow cytometry. As shown in Fig. 2 , the inoculation of dead bacteria exhibited no effect on the numbers of Foxp3+ cells or Helios-Foxp3+ cells. These results do not rule out the possibility that the amount of dead bacteria inoculated was not sufficient, but suggest that live bacteria are required for the induction of Treg cells.
- Example 21 To confirm the induction of Treg cells by chloroform-resistant bacteria, another stool was obtained from the same person on a different day, treated with chloroform, and inoculated into IQI GF mice (7 mice, numbered from #C1 to C7). After 3-4 weeks, mice from #C1 to #C5 were sacrificed, and the small intestinal and colonic lamina intestinal lymphocytes from each mouse were separately collected, and examined for the expression of CD4 and Foxp3 by flow cytometry. Consistent with the findings in Example 19, colonization with chloroform-treated human feces significantly induced the accumulation of Foxp3+CD4+ Treg cells in colonic and small intestinal laminalitis ( Fig. 3 ). These results further support the notion that chloroform-resistant spore-forming bacteria can induce differentiation, proliferation and/or recruitment of Treg cells in intestinal lamina limbal.
- Example 22 To test whether Treg cell induction by chloroform-resistant spore-forming fraction of human intestinal bacteria is horizontally transmissible, IQI GF mice (6 mice, numbered from #D1 to #D6) were cohoused for 4 weeks with mice #C6 and #C7 in the same cage in a vinyl isolator. Lamina basement lymphocytes from colon and small intestine were isolated and examined for CD4 and Foxp3. Cohoused mice exhibited a significant increase in the percentage of Foxp3+ cells among CD4+ cells ( Fig. 4 ). Therefore, Treg cell induction by human intestinal bacteria is horizontally transmissible. These results let us assume a role of prominent components of the intestinal microbiota, rather than minor components, for the induction of Treg cells.
- Example 23 The frozen stock of cecal content from mouse #C4 was thawed, suspended in 10 times its volume (w/v) of PBS, and passed through a 70 micro meter cell strainer. The suspension was then treated with 3% chloroform, diluted 2000- or 20000-fold with PBS, and orally inoculated into GF IQI mice (2.5x10 5 or 2.5x10 4 bacterial cells /250 micro liter / head, respectively). The 2000-fold diluted sample was orally inoculated into 4 mice (designated as exGF+2000, numbered from #E1 to #E4), whereas 20000-fold diluted sample was inoculated into 8 mice (designated as exGF+20000, numbered from #F1 to #F8).
- the intestinal lamina propria lymphocytes were isolated and examined for CD4, Foxp3 and Helios. Both 2000- and 20000-fold diluted samples similarly induced a marked accumulation of Foxp3+CD4+ cells in the intestinal lamina propria ( Fig. 5 ). Therefore, the dose of bacteria for oral inoculation can be minimized to less than 2.5x10 4 bacterial cells.
- Example 24 The frozen stock of cecal content from mouse #F3, #F7 or #F8 was suspended in 10 times its volume (w/v) of PBS, passed through a 70 micro meter cell strainer, and treated with 3% chloroform. Then, the fecal suspension from mouse #F3 was orally inoculated into 5 GF mice (numbered from #G1 to #G5), that from #F7 mouse into 4 GF mice (numbered from #H1 to #H4), and that from #F8 mouse into 4 GF mice (numbered from #11 to #14). After 4 weeks, lymphocytes from colonic and small intestinal lamina basement were isolated and examined for CD4, Foxp3 and Helios expression by flow cytometry.
- mice exhibited a significant increase in the percentage of Foxp3 + cells among CD4 + cells in the intestinal lamina propria compared with untreated GF mice ( Fig. 6 ). Therefore, the Treg cell induction by human intestinal bacteria colonizing in exGF+20000 mice is also transmissible. Moreover, as shown in the later meta 16S rDNA sequencing data ( Fig. 8 ), these mice commonly had bacteria having 16S rDNA sequence similarities with 16S rDNA sequence similarities with 20 species of known bacteria (C. aminophilum, H. saccgarovorans, E. fissicatena, H.filiformis, C. clostridioforme, C. indolis, C.
- Example 25 A frozen stock of the cecal content from #F8 mouse was serially diluted with 0.85% NaCl under an aerobic condition and plated onto BL agar. After culture at 37 °C for 2 or 4 days, 50 single colonies were observed. Of the 50 colonies, 29 were picked up, cultured for additional 2 or 4 days at 37 °C by ABCM broth, and stored in EG stock medium (10% DMSO) at -80°C. The genomic DNA from each colony was isolated, and 16S rRNA coding gene sequence was analyzed.
- the sequence of 16S rRNA of each colony revealed that the 29 colonies observed were represented by three strains, each having 100 % similarity with Clostridium ramosum, 99.75 % with Clostridium saccharogumia, 100 % with Flavonifractor plautii, 99.17 % with Clostridium hathewayi, 99.23 % with Clostridium scindens, or 99.66 % with Clostridium sp. 2335. Within the 29 colonies that were selected from the original 50 colonies, only Clostridium saccharogumia, Clostridium ramosum, and Flavonifractor plautii were present (25, 3, and 1 colonies, respectively).
- Example 26 The frozen glycerol stock of cecal content from #G2 mouse was suspended with PBS, seeded onto BL agar plate, and incubated for 48 hours, similarly to the procedure done in Example 19. Different from Example 19, all bacteria on the plate were collected by scraping with a plate scraper, suspended in TS broth and inoculated into GF IQI mice (4 mice, numbering from #K1 to #K4). It should be noted that the bacterial suspension used in this experiment included bacteria that did not propagate but survived on the plate. After 4 weeks, lamina intestinal lymphocytes from colon and small intestine of K1 ⁇ K4 mice were isolated and examined for CD4, Foxp3 and Helios expression.
- mice exhibited a significant increase in the percentages of Foxp3+ cells among CD4 + cells ( Figs. 9A, 9B ) and Helios- cells among Foxp3+ Treg cells ( Figs. 9A, 9C ) in the intestinal lamina intestinal compared with untreated GF mice.
- Figs. 9A, 9B CD4 + cells
- Figs. 9A, 9C Helios- cells among Foxp3+ Treg cells
- Example 27 Bacterial DNA was extracted from the cecal contents of mouse #A1, #C4, #F8, #G2, #H3, #13, #J3 and #K3.
- Variable region 1-2 (V1-2) in bacterial 16S rRNA coding gene were amplified by PCR and used as template for metasequencing.
- Resulting sequences (3400 reads for each sample) were classified into operational taxonomic units (OTUs) on the basis of sequence similarity (>97 % identity). Representative sequences from each OTU were compared with sequences in nucleic acid databases using BLAST to determine their closest relatives in known species. The numbers of detected reads and the closest relatives for each OTU are shown in Table 1.
- Fig. 8 The relative abundances of OTUs having the same closest relative in each cecal sample are shown in Fig. 8 .
- mouse #A1 153 OTUs (their closest relatives were 93 species) were identified and half of them were related to Bacteroides species.
- mouse #C4 113 OTUs were identified and most of them were related to species belonging to the family Clostridiaceae.
- mouse #F8, #G2, #H3, #13, #J3 and #K3, 97-68 OTUs were identified.
- Treg cell accumulation was observed in the intestine
- the majority of bacteria consisted of bacteria having 16S rDNA sequence similarities with C. aminophilum, H. saccgarovorans, E.
- fissicatena H.filiformis, C. clostridioforme, C. indolis, C. bolteae, Bacteroides sp. MANG, L. bacterium DJF_VP30, Ruminococcus sp. ID8, C. lavalense, C. symbiosum, E. contortum, C. saccharogumia, C. ramosum, F. plautii, C. scindens, Clostridium sp. 2335, Clostridium sp. 14616 and cf Clostridium sp. MLG055.
- Example 28 Bacterial strains were isolated from the cecal contents of mouse #F8, #G2, #11 and #K3 using BL agar or EG agar plates. Applicant picked-up 144 colonies from EG agar plates and 116 colonies from BL agar plates. BLAST search of 16S rRNA coding sequence of these clones revealed that they belonged to 17 species, and each had 93 - 100% similarities with C. indolis, C. bolteae, Bacteroides sp. MANG, L. bacterium DJF_VP30, A.colihominis, Ruminococcus sp. ID8, C. lavalense, C. symbiosum, E. contortum, C.
- Clostridium clusters IV, XIVa or XVIII (2 species of cluster IV, 12 of cluster XIVa, 1 of cluster XVI and 2 of cluster XVIII).
- Example 29 Of the colonies selected in Example 28, additional colonies were picked and isolated and these strains were cultured using EG and BL media. BLAST search of 16S rRNA coding sequence of these clones revealed that they belonged to a total of 31 species (including the species mentioned in Example 28), and each had 93 - 100% similarities with Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- Example 30 To investigate whether the strains in Example 29 have the ability to induce Tregs in GF mice, 31 strains on Table 3 were mixed at equal amounts of media volume using TS media and inoculated into GF mice. A detailed analysis of the 16S rRNA sequences revealed that 8 of the 31 strains overlapped with other strains (see Table 3, indicated by an asterisk), resulting in 23 distinct bacterial strains. As shown in Figure 10 , when orally administered to GF mice, the mixture of the 23 strains (23mix) induced very strong levels of Tregs (35-40% in the colon lamina intestinal, >10% in the small intestine; Figure 10 ). These Tregs observed with colonization by 23mix were mostly Helios-.
- Example 31 To investigate whether the abundant members of the intestinal microbiota in the chloroform-resistant fraction of human intestinal bacteria, rather than the minor members, drive the induction of Treg cells, adult GF mice were inoculated with diluted caecal samples from mice that had been inoculated with the chloroform-resistant fraction of human intestinal bacteria (+huChlo mice) as described in example 19. As shown in Figure 11 , even when the huChlo mice cecal samples were diluted (diluted 2x10 4 and 2x10 5 ) to create +2x10 4 mice and 2x10 5 mice respectively, Tregs were induced in these adult GF mice.
- Example 32 To investigate whether the mix of 23 strains in Example 30 has the ability to induce Tregs in adult GF IQI mice more effectively than Faecalibacterium prausnitzii, a well-known human Clostridia strain characterized for enhancing regulatory cell functions, 23 strains in table 4 were mixed in equal amounts with media to make a cocktail, which was then administered to adult IQI GF mice. For comparison, Faecalibacterium prausnitzii was administered to another group of IQI GF mice. As shown in Figure 12 , when orally administered to adult IQI GF mice, the mixture of the 23 strains (23-mix) induced higher levels of Tregs than Faecalibacterium prausnitzii. Faecalibacterium prausnitzii (+Faecali.) showed negligible levels of Treg induction.
- Example 33 To investigate whether the microbiota communities in the +2x104 mice, described in example 31, were stable, serial oral inoculation of adult GF mice was performed to create +2x10 4 -re mice(secondary inoculation) and +2x10 4 -re-re(tertiary inoculation). As shown in Figure 13 there was significant induction of Tregs in both the +2x10 4 -re mice and the +2x10 4 -re-re mice.
- the caecal content of +2x 10 4 mice, described in example 31 was again diluted 2x10 4 -fold and orally inoculated into another set of adult GF mice (+(2x10 4 ) 2 mice). As shown in Figure 13 , the +(2x10 4 ) 2 mice exhibited a marked accumulation of Treg cells in the colon.
- Example 34 To assess the composition of the gut microbiota in +huUT (+hu), +huChlo, +2x10 4 , +2x10 4 -re and +(2x10 4 ) 2 , described in example 19, example 31, and example 33, bacterial DNA was extracted from the caecal contents of these adult mice.
- the variable region (V1-V2) of the bacterial 16S ribosomal DNA (rDNA) was amplified and metasequencing using a 454 sequencer was performed.
- the resulting sequences (3400 reads for each sample) were classified into operational taxonomic units (OTUs) based on sequence similarity (>96 % identity).
- Example 36 To investigate whether each of the 17 strains defined in example 35 could individually induce Tregs, adult GF mice were monocolonized with one of each of the 17 strains. As shown in Figure 16 , adult GF mice monocolonized with a single strain exhibited low to intermediate levels of Treg. Importantly, no single strain induced Tregs to the same extent as the mix of 17 strains.
- Example 37 To investigate whether subsets of the 17 strains described in example 35 could induce Tregs, randomly selected combinations of 3-5 strains were made: 3-mix, 5mixA, 5-mix B, and 5-mix C, as shown in table 4, and used to inoculate adult GF mice. As shown in Figure 17 , only the 5-species mixes induced significant increases in the frequency of Treg cells, the magnitude of which was intermediate compared with that observed in +17-mix mice.
- Example 38 To investigate the benefits of administration of the mix of the 17 strains described in example 35 (17-mix), adult SPF mice were orally inoculated with either 17-mix or control media and assessed for the induction of Foxp3+ Treg cells three weeks later. As shown in Figure 18 , there was a significant increase in the frequency of colonic Foxp3+ Treg (CD4) cells after three weeks of treatment.
- CD4 colonic Foxp3+ Treg
- Example 39 To evaluate the benefit of administration of 17-mix in an animal model of allergic diarrhea, adult SPF mice were orally inoculated with 17-mix or control media while being treated with ovalbumin (OVA), an inducer of allergic diarrhea. As shown in Figure 19 , the occurrence and severity of diarrhea (diarrhea score) was significantly reduced in mice fed 17-mix relative to control mice.
- OVA ovalbumin
- Example 40 To evaluate the benefit of administration of 17-mix in an animal model of colitis, .
- Adult SPF mice were orally inoculated with either 17-mix or control media while being treated with trinitrobenzene sulfonic acid (TNBS),a frequently used experimental inducer of colitis.
- TNBS trinitrobenzene sulfonic acid
- SPF 17-mix mice demonstrated lower mortality than control mice on exposure to TNBS.
- the compositions and methods described herein make it possible to provide an excellent and well-characterized composition for inducing proliferation or accumulation of regulatory T cells (Treg cells) by utilizing certain human-derived bacteria belonging to the Clostridia class or a physiologically active substance or the like derived from the bacteria.
- the bacterial composition has immunosuppressive effects, the bacterial composition can be used, for example, to prevent or treat autoimmune diseases or allergic diseases, as well as to suppress immunological rejection in organ transplantation or the like.
- healthy individuals can easily and routinely ingest the bacterial composition, such as in food or beverage, (e.g., a health food), to improve their immune functions.
- compositions that induces proliferation and/or accumulation of regulatory T cells comprising: (a) one or more bacteria of the Clostridia class; (b) a culture supernatant of one or more bacteria of (a); (c) one or more physiologically active substance derived from (a) or (b); or (d) a combination of any 2 or 3 of (a), (b) and (c) .
- composition of paragraph 1, wherein the one or more bacteria of (a) are human-derived commensal bacteria (species) belonging to Clostridium Cluster IV and Clostridium Cluster XIVa.
- composition of paragraph 1, wherein the one or more bacteria of (a) is one or more human-derived commensal bacteria (species) belonging to Clostridium Cluster XIVa
- Clostridium bolteae ATCC BAA-613 Clostridium bolteae ATCC BAA-613, cf. Clostridium sp. MLG055, Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- Clostridium scindens Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium A4, Lachnospiraceae bacterium 3_1_57FAA_CT1, Clostridium sp. 316002/08, and Clostridiales bacterium 1_7_47FAA, ,
- a composition that induces proliferation and/or accumulation of regulatory T cells comprising, as an active component: (a) bacteria that contain DNA comprising a nucleotide sequence that has at least 90% homology with a DNA sequence designated herein as OTU136; OTU46; OTU221; OTU9; OTU296; OTU21; OTU166; OTU73; OTU174; OTU14; OTU55; OTU337; OTU314; OTU195; OTU306; OTU87; OTU86; OTU152; OTU253; OTU259; OTU281; OTU288; OTU334; OTU359; OTU362; or OTU367; and DNA comprising a nucleotide sequence that has at least 90% homology with DNA of one or more of the following: Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudof
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- compositions that induces proliferation and/or accumulation of regulatory T cells comprising at least two organisms and/or substances selected from the group consisting of: (a) Clostridium saccharogumia, Clostridium ramosum JCM1298, Clostridium ramosum, Flavonifractor plautii, Pseudoflavonifractor capillosus ATCC 29799, Clostridium hathewayi, Clostridium saccharolyticum WM1, Bacteroides sp.
- MANG Clostridium saccharolyticum, Clostridium scindens, Lachnospiraceae bacterium 5_1_57FAA, Lachnospiraceae bacterium 6_1_63FAA, Clostridium sp. 14616, Clostridium bolteae ATCC BAA-613, cf. Clostridium sp.
- MLG055 Erysipelotrichaceae bacterium 2_2_44A, Clostridium indolis, Anaerostipes caccae, Clostridium bolteae, Lachnospiraceae bacterium DJF_VP30, Lachnospiraceae bacterium 3_1_57FAA_CT1, Anaerotruncus colihominis, Anaerotruncus colihominis DSM 17241, Ruminococcus sp.
- compositions that induces proliferation or accumulation of regulatory T cells comprising, as an active ingredient, at least one physiologically active substance derived from bacteria containing DNA comprising a nucleotide sequence having at least 90% homology with any of SEQs ID NOs. 19 to 44.
- composition according to any one of paragraphs 1 to 10, wherein the composition has an immunosuppressive effect.
- a pharmaceutical composition comprising a composition according to any one of paragraphs 1 to 11 and a pharmaceutically acceptable component.
- a method of inducing proliferation, accumulation or both proliferation and accumulation of regulatory T cells in an individual in need thereof, comprising administering, to the individual, a composition of any one of paragraphs 1 to 11 or a pharmaceutical composition of paragraph 12.
- a method of inducing proliferation, accumulation or both proliferation and accumulation of regulatory T cells in an individual in need thereof comprising administering, to the individual, at least one organism or substance selected from the group consisting of:
- the method of paragraph 14 further comprising administering to the individual a substance selected from the group consisting of almond skin, inulin, oligofructose, raffinose, lactulose, pectin, hemicellulose, amylopectin, acetyl-Co A, biotin, beet molasses, yeast extracts, resistant starch, corticosteroids, mesalazine, mesalamine, sulfasalazine, sulfasalazine derivatives, immunosuppressive drugs, cyclosporin A, mercaptopurine, azathiopurine, prednisone, methotrexate, antihistamines, glucocorticoids, epinephrine, theophylline, cromolyn sodium, anti-leukotrienes, anti-cholinergic drugs for rhinitis, anti-cholinergic decongestants, mast-cell stabilizers, monoclo
- a method of increasing the levels of regulatory T cells in an individual undergoing a course of Gram+ antibiotics comprising administering a composition of any one of paragraphs 1 to 11 or a pharmaceutical composition of paragraph 12 to the individual.
- a method of selecting an individual for treatment with a composition according to any one of paragraphs 1 to 11 or a pharmaceutical composition of paragraph 12, comprising: (a) obtaining a (at least one) sample, such as a fecal sample or a colonic biopsy from an individual; (b) measuring in the individual's sample the percentages or absolute counts of bacterial species that belong to Clostridium Clusters IV and XIVa, thereby obtaining a measurement for the individual; (c) comparing the measurement of (b) with a corresponding measurement obtained from a sample from a healthy individual; and (d) selecting the individual for treatment with the composition according to any one of paragraphs 1 to 11 or a pharmaceutical composition of paragraph 12 if the measurement obtained in (b) is smaller than the measurement obtained from a sample from a healthy individual.
- a sample such as a fecal sample or a colonic biopsy from an individual
- measuring in the individual's sample the percentages or absolute counts of bacterial species that belong to Clostridium Clusters IV and XIVa,
- a method of selecting a bacterium that induces proliferation and/or accumulation of regulatory T cells comprising (a) isolating the bacterial spore-forming fraction from a fecal or biopsy sample obtained from a mammal; (b) plating serial dilutions of the isolated spore-forming fraction, and (c) picking a single colony from the culture plate.
- a process for producing a bacterial culture that induces proliferation and/or accumulation of regulatory T cells comprising (a) isolating the bacterial spore-forming fraction from a fecal or biopsy sample obtained from a mammal; (b) plating serial dilutions of the isolated spore-forming fraction, (c) picking a single colony from the culture plate that induces proliferation and/or accumulation of regulatory T cells by measuring one or more of: the expression of Fop3 Tregs, promotion of IL-10 expression, promotion of CTLA4 expression, promotion of IDO expression, and/or suppression of IL-4 expression as an index of the ability to induce proliferation or accumulation of regulatory T cells; and (e) culturing said picked colony.
- a bacterium obtainable by, or obtained by, the method of paragraph 20 or process of paragraph 24.
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